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# Sum & Difference Identities for Cosine

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In this lesson, we will learn about the sum and difference identities for cosine. We will use these identities to find an exact function value for cosine. Additionally, we will look at verifying a trigonometric identity using the sum and difference identities. Lastly, we will learn how to solve problems on finding the cos (s + t) when information about s and t is known.

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