Transformation of Trigonometric Identities
Product to sum · Sum to product · Proving identities
Derive the four product formulas
Derive the four sum formulas
Convert expressions in both directions
Prove identities using both sets
sin(A+B) = sin A cos B + cos A sin B
sin(A-B) = sin A cos B - cos A sin B
cos(A+B) = cos A cos B - sin A sin B
cos(A-B) = cos A cos B + sin A sin B
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