Integrate the functions $$\frac{1}{9x^2+6x+5}$$

Question

$\begin{array}{1 1} \frac{1}{6} \tan^{-1}\big(\frac{3x+1}{2}\big)+c \\ \frac{1}{3} \tan^{-1}\big(\frac{3x+1}{2}\big)+c \\ \frac{1}{6} \tan^{-1}\big(\frac{x+1}{2}\big)+c \\ \frac{1}{6} \tan^{-1}\big(2\frac{3x+1}{3}\big)+c \end{array}$