Using the additions of two angles and cosine

The video tutorial explains how to find the exact value of cosine for 13π/12 using the unit circle and the sum formula for cosine. The instructor breaks down the angle into the sum of two angles on the unit circle, applies the sum formula, and calculates the exact values using known coordinates. The process involves identifying the correct angles, applying trigonometric identities, and simplifying the result to find the cosine of 13π/12.

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