Partielle Integration

∫abf(x)g′(x)dx=(f⋅g)∣ab−∫abf′(x)g(x)dx\begin{equation} \int_{a}^{b} f(x) g^{\prime}(x) \mathrm{d} x=\left.(f \cdot g)\right|_{a} ^{b}-\int_{a}^{b} f^{\prime}(x) g(x) \mathrm{d} x \end{equation}