SOLUTION: We are proving identities and my book only has three examples. So I was hoping I could get some help solving a problem my teacher assigned on our test. I failed to answer it correc

Question 309689: We are proving identities and my book only has three examples. So I was hoping I could get some help solving a problem my teacher assigned on our test. I failed to answer it correctly, but he will be doing similar problems on our final exam.
cos^2 x cos^2 y = -sin(x+y) sin(x-y)
If you could show the steps and explain them I'd greatly appreciate it.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Unfortunately, cos^2 x cos^2 y = -sin(x+y) sin(x-y) is NOT an identity. You must be missing a symbol either in between the terms cos^2 x and cos^2 y or in between the terms -sin(x+y) and sin(x-y). Please repost with the correct problem.
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