Chapter 7.1, Problem 1QCE

Use algebraic manipulation and (if necessary) u-substitution to integrate the function.

$\begin{array}{l}\text{(a)}{\displaystyle \int \frac{x+1}{x}dx=\text{\_\_\_\_\_}}\\ \text{(b)}{\displaystyle \int \frac{x+2}{x+1}dx=\text{\_\_\_\_\_}}\\ \text{(c)}{\displaystyle \int \frac{2x+1}{x^2+1}dx=\text{\_\_\_\_\_}}\\ \text{(d)}{\displaystyle \int x{e}^{3\ln x}dx=\text{\_\_\_\_\_}}\end{array}$