$x=\pi+2\pi k,k\in z$

$x=\frac{\pi}{2}+2\pi k,k\in z$

$x=-\frac{\pi}{2}+2\pi k,k\in z$

$x=\arcsin a+\pi n,n\in z$

$x=\left(-1\right)^n\arcsin a+\pi n,n\in z$

$x=\left(-1\right)^narccina+2\pi n,n\in z$

$x=\pi n,n\in z$

$x=2\pi n,n\in z$

$x=\pi+2\pi n,n\in z$

$x=\pm\arccos a\ +\pi k,k\in z$

$x=\pm\arccos a+2\pi k,k\in z$

$x=\arccos a+2\pi k,k\in z$

$x=ar\operatorname{ctg}a+2\pi k,k\in z$

$x=\pm ar\operatorname{ctg}a+\pi k,k\in z$

$x=ar\operatorname{ctg}a+\pi k,k\in z$

$x=\operatorname{arcctg}a+2\pi k,k\in z$

$x=\pm arccrga+\pi k,k\in z$

$x=\operatorname{arcctg}a+\pi k,k\in z$

$x=ar\operatorname{ctg}\ \frac{3}{2}+\frac{\pi k}{2}$

$x=tg\ \frac{3}{2}+\frac{\pi k}{2}$

$x=ar\operatorname{ctg}\ \frac{\sqrt{3}}{2}+\frac{\pi k}{2}$

 $x=\left(-1\right)^{k+1}\ \frac{\pi}{4}+\pi k$  

 $x=\left(-1\right)^{k+1}\ \frac{\pi}{6}+\pi k$  

 $x=\left(-1\right)^{k+1}\ \frac{\pi}{6}+\frac{\pi k}{2}$  

$x=-\ \frac{\pi}{4}+\pi k$

$x=\frac{\pi}{4}+\pi k$

$x=\pi+\pi k$