Question
use the product-to-sum formulas to rewrite the product as a sum or difference.$$\cos 2 \theta \cos 4 \theta$$
Step 1
We can use the product-to-sum formula for cosine, which is given by: $$\cos A \cos B = \frac{1}{2}(\cos(A - B) + \cos(A + B))$$ Show more…
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