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If int(ln(x+sqrt(1+x^2)))/(sqrt(1+x^2))d...

If `int(ln(x+sqrt(1+x^2)))/(sqrt(1+x^2))dx =asqrt(1+x^2)ln(x+sqrt(1+x^2))+b x+c` , then (A) `a=1,b =-1` (B) `a=1,b=1` (C) `a=-1, b=1` (D) `a=-1, b=-1`

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