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3. 4: Sum-to-Product and Product-to-Sum Formulas We can use the product-to-sum formulas to rewrite products of sines, products of cosines, and products of sine and cosine as sums or differences of sines and cosines
Product-to-Sum Trigonometric Formulas - Brilliant Product-to-sum trigonometric formulas can be very helpful in simplifying a trigonometric expression by taking the product term ((such as sin A sin B, sin A cos B, sinAsinB,sinAcosB, or cos A cos B) cosAcosB) and converting it into a sum The complete list of product-to-sum trigonometric formulas are as follows: