• Integration By Parts helps us to integrate products, a revision of the product rule for two differentiable functions: $(u(x)v(x))’ = u’(x)v(x) + u(x)v’(x)$

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Supposed $u$ and $v$ are both differentiable functions, then $\int u dv = uv - \int vdu$, or $\int f(x) g’(x) dx = f(x)g(x) -\int f’(x) g(x) dx$

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1. We first choose $u$ and $dv$ so that $u$ is easier to differentiate, and $v$ is easier to integrate