Make conjectures about the variations of the following functions. This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and increasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right) and decreasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right), for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( k\dfrac{\pi}{2};\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right) and decreasing at every interval with the form \left( k\dfrac{\pi}{2},\dfrac{\pi}{4}+k\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{2} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{2};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ \dfrac{\pi}{4}+\left(2k-1\right)\pi,\dfrac{\pi}{4}+2k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+2k\pi,\dfrac{\pi}{4}+\left(2k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and increasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and increasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and increasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ \dfrac{3\pi}{4}+2k\pi,\dfrac{3\pi}{4}+\left(2k+1\right)\pi\right] and decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+2k\pi,\dfrac{3\pi}{4}+2k\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right) and decreasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right), for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right) and decreasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right), for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right) and decreasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right), for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi,\dfrac{\pi}{2}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{2}+k\pi,\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and decreasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and decreasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ k\pi;k\pi+\dfrac{\pi}{4} \right] and increasing at every interval with the form \left[k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right], for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left[ -\dfrac{\pi}{4}+k\pi,\dfrac{\pi}{4}+k\pi\right] and increasing at every interval with the form \left[ \dfrac{\pi}{4}+k\pi,\dfrac{3\pi}{4}+k\pi\right], for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( k\dfrac{\pi}{2};\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right) and decreasing at every interval with the form \left( k\dfrac{\pi}{2},\dfrac{\pi}{4}+k\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( k\dfrac{\pi}{2};\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right) and decreasing at every interval with the form \left( k\dfrac{\pi}{2},\dfrac{\pi}{4}+k\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( k\dfrac{\pi}{2};\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right) and decreasing at every interval with the form \left( k\dfrac{\pi}{2},\dfrac{\pi}{4}+k\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.
This function is decreasing at every interval with the form \left( k\pi;k\pi+\dfrac{\pi}{4} \right) and increasing at every interval with the form \left(k\pi+\dfrac{\pi}{4};\left(k+1\right)\pi\right), for any k\in \mathbb{Z}.
This function is increasing at every interval with the form \left( \dfrac{\pi}{4}+k\dfrac{\pi}{2},\left(k+1\right)\dfrac{\pi}{2}\right), for any k\in \mathbb{Z}.
