TeX Quellcode:
\begin{array}{rcl} \displaystyle\int\limits_0^3 2x \, dx &=& 2\displaystyle\int\limits_0^3 x^1 \, dx \cr &=& 2\cdot\left[\dfrac{x^2}{2}\right]_0^3 \cr\cr &=& 2\left(\dfrac{3^2}{2}-\dfrac{0^2}{2}\right) \cr\cr &=& 2\cdot \dfrac{9}{2} \cr\cr &=& 9 \end{array}