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int(x^3)/(sqrt(1+x^2))\ dx=a(1+x^2)^(3se...

`int(x^3)/(sqrt(1+x^2))\ dx=a(1+x^2)^(3setminus2)+bsqrt(1+x^2)+C` , then `a=1/3,\ \ b=1` (b) `a=-1/3,\ \ b=1` (c) `a=-1/3,\ \ b=-1` (d) `a=1/3,\ \ b=-1`

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