Deriving the Sum and Difference Identities for Cosine - Finding Cos -s + t-

Explore the sum and difference identities for cosine in this comprehensive 32-minute video lesson. Learn how to derive both formulas and apply them to solve various problems. Discover techniques for finding exact cosine function values using these identities through multiple examples. Delve into cofunction identities and practice verifying trigonometric identities. Master the process of determining cos(s + t) and gain a deeper understanding of trigonometric functions and their relationships.

Cosine of a sum or difference formulas.
Deriving the formula for the sum identity for cosine.
Deriving the formula for the difference identity for cosine.
Finding exact cosine function values with sum and difference identities Example #1.
Finding exact cosine function values with sum and difference identities Example #2.
Finding exact cosine function values with sum and difference identities Example #3.
Cofunction identities.
Verifying identities with sum and difference identities Example #1.
Verifying identities with sum and difference identities Example #2.
Finding cos(s + t).