SOLUTION: Express sin(x)sin(x-y) as a difference of two cosines.

Question 1048795: Express sin(x)sin(x-y) as a difference of two cosines.
Answer by Edwin McCravy(20067) (Show Source): You can put this solution on YOUR website!

    



Subtract the 2nd equation from the 1st:



Multiply both sides by 1/2





Let A = x and B = x-y







That's ONE-HALF the difference of two cosines, which may be what
you want.  If not let me know in the thank-you note form below,
and I'll try to get rid of the ONE-HALF.

Edwin

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