1.

`int(dx)/(x^2+2x+2)`equals(A) `xtan^(-1)(x+1)+C` (B) `tan^(-1)(x+1)+C`(C) `(x+1)tan^(-1)x+C` (D) `tan^(-1)x+C`A. `tan^(-1) (x+1) +C`B. `(x+1) tan^(-1) x+C`C. `tan^(-1) x+C`D.

Answer» Correct Answer - b
`int (1)/(x^(2) +2x+2)dx = int (1)/((x^(2)+2x+1)+1)dx`
`= int (1)/((x+1)^(2)+1^(2))dx`
`=tan^(-1) (x+1)+c`


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