Integration by Parts/Also presented as

Integration by Parts: Also presented as
Integration by Parts is often seen presented in this sort of form:
 * $\displaystyle \int u \frac {\d v} {\d x} \rd x = u v - \int v \frac {\d u} {\d x} \rd x$

or:
 * $\displaystyle \int u \rd v = u v - \int v \rd u$

where it is understood that $u, v$ are functions of the independent variable.