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If tan^(-1)(x+1)/(x-1)+tan^(-1)(x-1)/x=t...

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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