Homework SourseUse a product to sum identity to rewrite the expression sin
Use a product to sum identity to rewrite the expression sin 38 degrees cos 21 degrees
Solution
sin 38 degrees cos 21 degrees
sinAcosB=(1/2)[sin(A+B)+sin(A-B)]
=(1/2)[sin(38+21)+sin(38-21)]
=(1/2)[sin(59)+sin(17)]
=(1/2)[sin(59O)+sin(17O)]
![Use a product to sum identity to rewrite the expression sin 38 degrees cos 21 degreesSolutionsin 38 degrees cos 21 degrees sinAcosB=(1/2)[sin(A+B)+sin(A-B)] =(1](/WebImages/13/use-a-product-to-sum-identity-to-rewrite-the-expression-sin-1014667-1761524138-0.webp "Use a product to sum identity to rewrite the expression sin 38 degrees cos 21 degreesSolutionsin 38 degrees cos 21 degrees sinAcosB=(1/2)[sin(A+B)+sin(A-B)] =(1")
