What are the sum and difference formulas for cosine

The video tutorial explains the cosine sum and difference formulas, which are used to evaluate angles that are not easily calculated using a calculator or unit circle. By breaking down a complex angle into two smaller angles, the exact trigonometric value can be determined. The tutorial covers the specific formulas for both the sum and difference of cosine, detailing the steps to calculate these values using smaller angles. The explanation includes the importance of following the correct formula to achieve accurate results.

What is the purpose of using the cosine sum and difference formulas?

How can you evaluate the cosine of an angle that is not on the unit circle?

Explain how to use the cosine sum and difference formulas to find the cosine of an angle.

What are the components of the cosine sum formula?

Describe the formula for the cosine of the difference of two angles.