# Inverse Trigonometric Functions

In this video, we are going to find the missing angle with the given sides.

The same SOHCAHTOA from the previous lesson will be needed to perform the functions.
$sin\theta = \frac{opposite}{hypotenuse}$
$cos\theta = \frac{adjacent}{hypotenuse}$
$tan\theta = \frac{opposite}{adjacent}$

For example:
$sin\theta = \frac{5}{10}$

Perform the inverse of sin in this situation.
$sin^{-1}(sin\theta) = sin^{-1}(\frac{5}{10})$

Enter $sin^{-1}$ into the calculator and insert the expression
$\theta = sin^{-1}(\frac{5}{10})$
$\theta = 30$