Evaluate ∫1x2+2x+5dx\int \frac{1}{x^2+2x+5} dx∫x2+2x+51dx.
12arctan(x+12)+C\frac{1}{2} \arctan(\frac{x+1}{2}) + C21arctan(2x+1)+C
arctan(x+12)+C\arctan(\frac{x+1}{2}) + Carctan(2x+1)+C
2arctan(x+1)+C2 \arctan(x+1) + C2arctan(x+1)+C
12ln(x2+2x+5)+C\frac{1}{2} \ln(x^2+2x+5) + C21ln(x2+2x+5)+C