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# Sum & Difference Identities for Sine & Tangent

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In this lesson, we will learn about the sum and difference identities for sine and tangent. These identities will allow us to get exact values of trigonometric functions. Additionally, we will see how to use these identities to simplify a trigonometric expression and to verify a trigonometric identity. Lastly, we will think about how to find function values and the quadrant of (A + B) or (A - B).

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