TeX Quellcode:
\begin{array}{rcl}\mathbb{D}&=&\mathbb{R}\setminus_{\{0\}} \cr \cr f(x) &=& -17x^{-19} \cr \cr \cr f'(x) &=& -17 \cdot \left(-19 \right) \cdot x^{-19-1} \cr &=& 323x^{-20} \cr \cr &=& \dfrac{323}{x^{20}} \end{array}