Evaluate $ \frac{2x+1}{x^2+x+2}\, dx$
1. $log(2x+1) + c$ where c is an arbitrary constant
2. $log\!\left(\frac{2x+1} {x^2+x+2}\right) + c$ where c is an arbitrary constant
3. $log(x^2+x+2) + c$ where c is an arbitrary constant
4. $log\!\left(\tfrac{1}{2}\right) + c$ where c is an arbitrary constant