Solving an equations using the sum and difference formulas of cosine

The video tutorial explains the use of trigonometric sum and difference formulas to solve equations. It begins with an introduction to the formulas for cosine, followed by their application to specific angles. The tutorial then demonstrates how to simplify expressions and solve equations using these formulas. Finally, it guides viewers through finding solutions within a specified range using the unit circle.

How do you find the sine of π/4 using the unit circle?

Describe the steps to rationalize the denominator when solving for sine of X.

What are the solutions for sine of X equals -√2/2 within the interval 0 to 2π?