Prove sin(x-y)/sin(y+x)=(tanx-tany)/(tanx+tany)

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These videos are scenes from a move "Prove Yourself, Epic Battle Against Trig Identities" working title. Due out later this month or whenever I finish it, if i finish it. enjoy.

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Or if we have to prove that sin( x+y)/sin( x- y) is equal to cot y+ cot x/ cot y - cot x then how we prove

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