- #1
MaoRaygo
- 1
- 0
Homework Statement
I've been having problems with a lot of identity problems lately, but I've found that I'm especially having issues with problems like this one;
Verify the identity,
1/2 Sin (4x) = 2SinxCosx-4Sin3xCosx
Homework Equations
My professor told me you use Sin(A-B)=SinACosB-CosASinB
The Attempt at a Solution
The best I could do was
1/2 Sin4x=2SinxCox-4Sin3xCos
1/2Sin4x=2(SinxCosx-2sin3)
1/2Sin4x=2Sin(x-4x)=-2Sin(3x)
I know that this is a horrible attempt at solving, but some help would be greatly appreciated.