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If `int (xtan^(-1)x)/sqrt(1+x^2) dx = sqrt(1+x^2)f(x)+Aln|x+sqrt(x^2+1)|+c` thenA. `f(x) = tan^(-1)x, A=-1`B. `f(x) = tan^(-1)x,A=1`C. `f(x)=2tan^(-1)x, A=-1`D. `(x) = 2tan^(-1)x,A=1`

Answer» Correct Answer - a


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