Use the product-to-sum formulas to rewrite the product as a sum or difference. 4 cos 2θ cos 4θ
Added by Jes-S C.
Step 1
First, we need to recall the product-to-sum formula for cosine, which is: cosA cosB = 1/2 [cos(A - B) + cos(A + B)] Now, we can apply this formula to the given expression: 4 cos 2θ cos 4θ = 2 [cos(2θ - 4θ) + cos(2θ + 4θ)] Show more…
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