Verify the identity using sum and difference formula

The video tutorial explains how to solve a trigonometric problem by working through the steps of identifying variables, verifying formulas, and using the unit circle for calculations. The teacher guides students through the process of evaluating the cosine of π/2 and concludes with the final result, ensuring the solution matches the expected outcome.

What is the value of cosine at π halves according to the unit circle sketch?

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What conclusion is drawn about cosine of X at the end of the evaluation?

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