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If int((x^2+1)e^x)/((x+1)^2)dx=f(x)e^x+C...

If `int((x^2+1)e^x)/((x+1)^2)dx=f(x)e^x+C,` where C is a constant, then `(d^3f)/(dx^3)` at x = 1 is equal to :

A

`-3/4`

B

`3/4`

C

`-3/2`

D

`3/2`

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