Pre-Calculus - Using the difference of angles for cosine to evaluate for an angle cos(225-30)

The video tutorial explains how to find the cosine of the difference between two angles, 225 degrees and 30 degrees, using the cosine difference formula. It involves evaluating the cosine and sine of each angle using the unit circle, then applying these values to the formula. The tutorial concludes with simplifying the expression to find the final result.

How do you apply the difference formula for cosine?

Explain the process of evaluating the angles before plugging them into the formula.

What is the cosine of 30 degrees?

What are the sine and cosine values for 225 degrees?

What is the final answer after simplifying the expression derived from the cosine difference formula?