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

If `int (x^3dx)/sqrt(1+x^2)=a(1+x^2)^3/2+bsqrt(1+x^2)+C`, then

A

`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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