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tan^(-1)(1/2)+tan^(-1)(1/2)=?...

`tan^(-1)(1/2)+tan^(-1)(1/2)=?`

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Evaluate 2tan^(-1)(1/2)+tan^(-1)(1/4)

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

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tan^(-1)(1)/(4)+tan^(-1)(2)/(9)=tan^(-1)(1)/(2)

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