Benedict Irwin added Explaination.tex  over 9 years ago

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\section{Explaination}  Of course, can be explained by \begin{equation}  \int_a^b x\frac{du}{dx} \;dx = -c + [xu]_a^b  \end{equation}  Where $c$ is the integral from $a$ to $b$ of $u$. That way if the $xu$ term vanishes, the identity holds...