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int (dx)/(x^2 + 2x + 2) equals :...

`int (dx)/(x^2 + 2x + 2)` equals :

A

`x tan^-1 ( x + 1) + c`

B

`tan^-1 ( x + 1) + c`

C

`(x+ 1) tan^-1 x + c`

D

`tan^-1 x + c`.

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