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Find the value of tan-1 3 - cot-1 (-3)
tan-1 (3) -cot-1 (-3) = yas cot-1 (-x) = π - cot-1 x∴ y = tan-1 (3) - (π - cot-1(3)) = π3 - π - π6 = π3 -π + π6 = π2 -π = - π2
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