5. Inverse Trigonometric Functions and Basic Trigonometric Equations

Evaluate the expression.

$\cos^{-1}\left(-1\right)$

Evaluate the expression.

$\cos^{-1}\left(0\right)$

Evaluate the expression.

$\cos^{-1}\left(-\frac{\sqrt2}{2}\right)$

Evaluate the expression.

$\sin^{-1}1$

Decide whether each statement is true or false. If false, explain why.

The tangent and secant functions are undefined for the same values.​​