Evaluate ∫dxx2+4x+5\int \frac{dx}{x^2+4x+5}∫x2+4x+5dx.
12arctan(x+22)+C\frac{1}{2} \arctan(\frac{x+2}{2}) + C21arctan(2x+2)+C
arctan(x+22)+C\arctan(\frac{x+2}{2}) + Carctan(2x+2)+C
2arctan(x+2)+C2 \arctan(x+2) + C2arctan(x+2)+C
arctan(x+2)+C\arctan(x+2) + Carctan(x+2)+C