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[" Prove that: "],[2tan^(-1)(1)/(2)+tan^...

[" Prove that: "],[2tan^(-1)(1)/(2)+tan^(-1)(1)/(7)=tan^(-1)(31)/(17)]

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Prove that 2"tan"^(-1)(1)/(2) +"tan"^(-1)(1)/(7) ="tan"^(-1)(31)/(17) .

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