Using sum and difference formula to find the exact value with cosine

The video tutorial covers the challenge of finding angles on the unit circle, specifically π/12 and 7π/12. It explains how to break these angles into sums or differences of known angles like π/3 and π/4. The tutorial compares working with degrees and radians, highlighting the ease of degrees. It also demonstrates using the cosine addition formula to solve trigonometric problems, emphasizing the importance of identifying angles and using the unit circle for validation.

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