# 2. You are required to write the product cos4u cos7u as a sum of two trigonometric...

###### Question:

2. You are required to write the product cos4u cos7u as a sum of two trigonometric functions. Use the identity cos A cos B = ][cos(A – B) + cos(A + B)] cos A cos B = { [cos(A – B) + cos(A + B)]to do so. In this given problem A = ? and B ? therefore cos4u cos7u =

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