\text { Evaluate the integralt } \int \frac{36 x+18}{1+9 x+9 x^{2}} d x \ln \left|9 x^{2}+9 x+1\right|+c 2 \ln \left|9 x^{2}+9 x+1\right|+c 2 \ln |36 x+18|+c 2\left(9 x^{2}+9 x+1\right)+c