$$\int \frac { d x } { x \sqrt { x ^ { 2 } + x - 2 } }$$
$\int \frac{1}{x\sqrt{\left(x-1\right)\left(x+2\right)}}\mathrm{d}x$
$\frac{1}{x\sqrt{\left(x-1\right)\left(x+2\right)}}$
