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tan-1x+cot-1x=π/2 |
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Answer» Take sin on both sides sin(tan−1x+cot−1x) We know that tan−1x+cot−1x=pi/2, where −∞<x<∞ =sin(tan−1x+pi/2−tan−1x) =sin(pi/2) =1 Hence proved |
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