SOLUTION: Prove each identity: sin(x)sin(y)(cot(x)cot(y)-1)= cos(x+y)

SOLUTION: Prove each identity: sin(x)sin(y)(cot(x)cot(y)-1)= cos(x+y)

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Question 309287: Prove each identity:
sin(x)sin(y)(cot(x)cot(y)-1)= cos(x+y)

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

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