Don't always pick what you think is the most complicated side

The video challenges the common belief of always starting with the most complicated side when working with trigonometric identities. It explains that using identities can simplify the process and demonstrates this by applying sum and difference formulas. The instructor emphasizes converting expressions to sines and cosines for easier manipulation and provides a step-by-step guide to simplifying expressions. The video concludes with verifying the identity and encourages students to understand and apply identities effectively.

How does the speaker suggest verifying that an expression is an identity?

What is the significance of converting expressions to sines and cosines when working with identities?

Summarize the conclusion reached about the identity at the end of the video.