How to use the cosine function to find the missing side of a triangle

The video tutorial explains how to identify the adjacent side in a right triangle when given the hypotenuse. It demonstrates using the cosine function to solve for the unknown side length, X, by setting up the equation cosine of 32 degrees equals X over 5. The tutorial guides students through solving the equation by multiplying both sides by 5 and using a calculator to find the approximate value of X, rounded to the third decimal place.

What should you ensure about your calculator mode when calculating cosine values?

What is the approximate value of X when calculated as 5 times cosine of 32 degrees, rounded to the third decimal place?