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P.T. tan-1 – cot-1 x = π/2 ∀ x ∈ R |
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Answer» Let tan-1 x = y x = tan y = cot (π/2 - y) cot-1 x = π/2 - y cot-1 x + y = π/2 cot-1 x – tan-1 x = π/2 |
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