
A list of common formulas, not in any way complete.

TODO: Just a tad more labeling.

## Integration

### Trigonometric substitutions

shape substitution
$\sqrt{r^2 - x^2}$ $x = r \sin u$ (or $x = r \cos u$)
$\sqrt{x^2 - r^2}$ $x = \frac{r}{\cos u}$
$\sqrt{x^2 + r^2}$ $x = r \tan u$