5. Inverse Trigonometric Functions and Basic Trigonometric Equations

Find all solutions to the equation.

$\cos x=1$

Find all solutions to the equation.

$\tan\theta=1$

Find all solutions to the equation.

$\sin\theta=-\frac{\sqrt3}{2}$

Find all solutions to the equation.

$3\sin\theta-6=-9$

Find all solutions to the equation.

$\sqrt2\cos\theta+4=5$