1.

` (d)/(dx) {cos ^(-1)""(x-x^(-1))/(x+x^(-1))} =`A. ` (1)/(1+x^(2) ) `B. ` (-2)/(1+x^(2) ) `C. ` (2)/(1-x^(2))`D. इनमें से कोई नहीं

Answer» Correct Answer - B


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