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[" I Question No.To one of shor tanswer type.Eal "],[" marks."],[" Prove that: "2tan^(-1)(1)/(3)+tan^(-1)(1)/(7)=(pi)/(4)]

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prove that 2(tan^(-1)1)/(3)+(tan^(-1)1)/(7)=(pi)/(4)

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Prove that : tan^(-1)2+tan^(-1)3=(3 pi)/(4)