SOLUTION: Prove sin(4x)=8sin(x)cos^3(x)-4sin(x)cos(x)

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Question 1151813: Prove
sin(4x)=8sin(x)cos^3(x)-4sin(x)cos(x)
Answer by Edwin McCravy(20067)   (Show Source): You can put this solution on YOUR website!
We use two identities

     
and
     

to prove:



Begin with the left side:













Edwin
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