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If int(x+sqrt(1+x^2))^n dx=A(x+sqrt(1+x^...

If `int(x+sqrt(1+x^2))^n dx=A(x+sqrt(1+x^2))^(n+1)+B(x+sqrt(1+x^2))^(n-1)+c` then `1/A+1/B=`

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If int(xln(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

If int(xln(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