1. ## identity proof

PROVE:
sin4x = 2sin2xcos2x

2. Originally Posted by chopstixdcb
PROVE:
sin4x = 2sin2xcos2x
Use the fact that 4x=2x+2x and that sin(a+b)=sin(a)cos(b)+cos(a)sin(b).

3. Or, if you already know that sin(2x)= 2 sin(x)cos(x), just replace x with 2x.

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# prove that sin(4x)

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