Find the general solution of the following trigonometric equations :

${\sin }^{2}2x=0$

Find the general solution of the following trigonometric equations :

$\cot 4x=0$

Find the general solution of the following trigonometric equations :

${\cos }^{3}4x=0$

Find the general solution of the following trigonometric equations :

${\cot }^{2}5\theta =0$

Find the general solution of the following trigonometric equations : 

$\sin \theta =\frac{\sqrt{3}}{2}$

Find the general solution of the following trigonometric equations : 

$\tan 3\theta =-1$

Find the general solution of the following trigonometric equations :

$\sec 2\theta =-2$

Find the general solution of $\cos \theta =-\frac{\sqrt{3}}{2}$.

Find the general solution of the following trigonometric equations :

$\cos 5x=-\frac{1}{\sqrt{2}}$