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Sum to Product Formulas for Sine and Cosine
Relation of the sum or difference of two trigonometric functions to a product.
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Sum-to-Product Formulas - Example 2
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Find the exact value of trigonometric functions using a sum-to-product formula
MAT.TRG.307.5 (Sum to Product Formulas for Sine and Cosine - Trigonometry)
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