This is another problem which I am not able to complete Prove the following identity. sin(4x) = 8sin(x)cos^3(x)-4sin(x)cos(x)
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Originally Posted by MathRaven This is another problem which I am not able to complete Prove the following identity. sin(4x) = 8sin(x)cos^3(x)-4sin(x)cos(x) $\displaystyle \sin(4x)=2\sin(2x)\cos(2x)=2[2\sin(x)\cos(x)][2\cos^2(x)-1]$
is that showing all the steps which you took?
Originally Posted by MathRaven is that showing all the steps which you took? it's your turn, how did he get from the 1st to the 2nd step? ... and from the 2nd to the 3rd?
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