Use the sum-to-product formulas to rewrite the sum or difference as a product. cos 8x + cos 4x
Added by Kari C.
Step 1
Step 1: Use the sum-to-product formula for cosine: \( \cos(A) + \cos(B) = 2\cos\left(\frac{A+B}{2}\right)\cos\left(\frac{A-B}{2}\right) \) Show more…
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