## Integration

1. \begin{aligned} \int \frac{6x}{\sqrt{1+x^2}} \ \textrm{d}x = \end{aligned} Check here for my solution 2. \begin{aligned} \int \frac{x}{1+x^2} \ \textrm{d}x = \end{aligned} Check here for my solution 3. \begin{aligned} \int \frac{x^2}{1-x^2} \ \textrm{d}x = \end{aligned} Check here for my solution 4. \begin{aligned} \int \ln (2x+1) \ \textrm{d}x = \end{aligned} Check here for my solution 5. \begin{aligned} …