Using sum and difference formulas to verify a trigonometric identity

The video tutorial explains how to verify a trigonometric identity involving π and θ. It begins with an introduction to the identity and a review of the cosine and sine difference formulas. The instructor then applies these formulas to verify the identity, simplifying the expression step by step. The tutorial concludes with a successful verification, demonstrating that the left side equals the right side.

What simplifications occur when evaluating the sine and cosine values?

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What conclusion is reached at the end of the verification process?

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