Evaluate ∫1x2+4x+8dx\int \frac{1}{x^2+4x+8} dx∫x2+4x+81dx.
12arctan(x+22)+C\frac{1}{2} \arctan(\frac{x+2}{2}) + C21arctan(2x+2)+C
arctan(x+2)+C\arctan(x+2) + Carctan(x+2)+C
14arctan(x+22)+C\frac{1}{4} \arctan(\frac{x+2}{2}) + C41arctan(2x+2)+C
ln(x2+4x+8)+C\ln(x^2+4x+8) + Cln(x2+4x+8)+C