In Exercises 1151, prove the identity.sin5 x = 11 - 2 cos2
Chapter 5, Problem 5.1.1.167(choose chapter or problem)
In Exercises 11–51, prove the identity.
\(\sin ^{5} x=\left(1-2 \cos ^{2} x+\cos ^{4} x\right)(\sin x)\)
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