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2tan^(-1)(1)/(2)+tan^(-1)(1)/(7)=tan^(-1...

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

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

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