Question
Using Product-to-Sum Identities In Exercises $41-46$ find the indefinite integral.$$\int \cos 5 \theta \cos 3 \theta d \theta$$
Step 1
We can use the product-to-sum identity for cosine, which is $\cos a \cos b = \frac{1}{2}(\cos(a+b) + \cos(a-b))$. Show more…
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