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OpenStudy (anonymous):
Prove: (can only solve from left side to prove right side) (tanx+tany)/(cotx+coty)=tanx*tany
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OpenStudy (loser66):
denominator : cot x + cot y = \(\dfrac{1}{tanx}+\dfrac{1}{tany}\) = \(\dfrac{tany +tanx}{tanxtany}\) now, put them under the numerator |dw:1387136082125:dw|
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