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[" 25.If "tan^(-1)(x+1)/(x-1)+tan^(-1)(x...

[" 25.If "tan^(-1)(x+1)/(x-1)+tan^(-1)(x-1)/(x)=tan^(-1)(-7)" ,then the value of "x" is "],[[" (a) "0," (b) "-2," (c) "1," (d) "2]]

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