Question
Prove the following identities.$$4 \sin ^{4} \theta=1-2 \cos 2 \theta+\cos ^{2} 2 \theta$$.
Step 1
Step 1: We start with the right-hand side of the equation, which is $1-2 \cos 2 \theta+\cos ^{2} 2 \theta$. Show more…
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