How to prove the cofunction identities using sum and difference formulas

The video tutorial explains the sum and difference identities for trigonometric functions, focusing on sine and cosine. It demonstrates how to apply these identities to verify that the left side of an equation equals the right side. The instructor emphasizes the importance of understanding the roles of U and V in the formulas and clarifies common misconceptions. The tutorial also covers the evaluation and simplification of trigonometric expressions using these identities.

What should you think of when you see sine, cosine, or tangent in relation to angles?

Explain the significance of the cofunction identity in solving trigonometric problems.

How do you apply the sum and difference formulas for sine and cosine?

What is the sine of π/2 and how does it relate to the unit circle?

Describe the outcome when evaluating cosine of X minus cosine of π/2.