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OpenStudy (anonymous):
sin(x+y)/(sin (x-y))=a+b/a-b then tan x/tan y===??
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OpenStudy (anonymous):
expand sin(x+y) and sin(x-y) using trigonometry formulae then apply componendo dividendo (Nr. + Dr.) / (Nr. - Dr.) on both sides LHS will reduce to tan x / tany
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