Verifying an identity using the sum and difference formulas

The video tutorial explains how to verify mathematical identities by focusing on one side of the equation. It highlights the difference between verifying and simplifying expressions and demonstrates the application of a formula to simplify and verify an identity. The tutorial concludes with a simplification process, emphasizing the practice of using identities.

What is the first step in verifying a trigonometric identity according to the text?

Explain the difference between simplifying an expression and verifying an identity.

Why did the speaker choose to work on the left side of the identity?

What formula did the speaker apply to simplify the left side?

What is the final expression obtained after simplifying the left side?