TeX Quellcode:

\begin{array}{rcl}\mathbb{D}&=&\mathbb{R}\setminus_{\{0\}} \cr \cr f(x) &=& 6x^{-1} \cr \cr \cr f'(x) &=& 6 \cdot \left(-1 \right) \cdot x^{-1-1} \cr &=& -6x^{-2} \cr \cr &=& -\dfrac{6}{x^2} \end{array}