SOLUTION: Prove that Cot y - cot x = sin (x-y) / sinx sin y

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Question 464327: Prove that
Cot y - cot x = sin (x-y) / sinx sin y
Answer by Gogonati(855) About Me  (Show Source):
You can put this solution on YOUR website!
We make identical transformations on the left side until reach an expression same
with the right side..