TeX Quellcode:

\begin{array}{rcl} \mathbb{D} &=& \mathbb{R} \cr\cr f'(x) &=& -\dfrac{10}{9} \cdot 18 \cdot x^{18-1}-11 \cdot 1 \cdot x^{1-1} \cr &=& -20x^{17}-11 \end{array}