Express the following sum or difference as a product: cos 2x – cos 4x
Added by Shelby M.
Step 1
Step 1:** Apply the formula for cosine of a difference: \( \cos(A) - \cos(B) = 2 \sin\left(\frac{A + B}{2}\right) \sin\left(\frac{A - B}{2}\right) \) ** Show more…
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