Verify the identity: 2cos4xsin2x=2sin3xcos3x-2cosxsinx.

I know I have to use the product to sum identities but im still stuck.

So far I have, sin(3x+3x)+sin(3x-3x)-sin(x+x)-sin(x-x)

What happens to the sin after you subtract 3x-3x and x-x?

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- Apr 6th 2008, 03:52 PMkelsey3Verifying trig identities
Verify the identity: 2cos4xsin2x=2sin3xcos3x-2cosxsinx.

I know I have to use the product to sum identities but im still stuck.

So far I have, sin(3x+3x)+sin(3x-3x)-sin(x+x)-sin(x-x)

What happens to the sin after you subtract 3x-3x and x-x? - Apr 6th 2008, 04:39 PMTheEmptySet
- Apr 6th 2008, 04:53 PMo_O
Think Soroban got it in the other, double-posted thread.