If sin^(-1)(x-1)+cos^(-1)(x-3)+tan^(-1)(...

If `sin^(-1)(x-1)+cos^(-1)(x-3)+tan^(-1)(x/(2-x^2))=cos^(-1)k+pi,` then the value of `k` is (a)1 (b) `-1/(sqrt(2))` (c) `1/(sqrt(2))` (d) non of these

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