SOLUTION: (sin^4x-2sin^2x+1)cosx=cos^5x I have to verify the identity.I know I have to try and prove one side or the other. so I started out trying to solve the left side. I multiplie

Question 942007:
(sin^4x-2sin^2x+1)cosx=cos^5x
I have to verify the identity.I know I have to try and prove one side or the other. so I started out trying to solve the left side. I multiplied it all by cosx but that seemed to complicate things.
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Identity is pretty simple to verify; however you have to notice that

. Using

, we have

, so the LHS equals

.
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