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the value of 3tan^- 1(1/4)+tan^- 1(1/20)...

the value of `3tan^- 1(1/4)+tan^- 1(1/20)+tan^- 1(1/1985)`

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tan^(- 1)(1/4)+tan^(- 1)(2/9)=1/2tan^(- 1)(4/3)

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The value of tan^-1(1/3)+tan^-1(2/9)+tan^-1(4/33)+tan^-1(8/129)+....n terms is: