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" 14.If "tan^(-1)(x+1)+tan^(-1)(x-1)=tan...

" 14.If "tan^(-1)(x+1)+tan^(-1)(x-1)=tan^(-1)(8)/(31)," then "

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If tan ^(-1)(x+1)+tan ^(-1)(x-1)=tan ^(-1) (8)/(31) then x=

tan^(-1)(n+1)+tan^(-1)(n-1)=tan^(-1)(8/31)

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