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.

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