TeX Quellcode:

\begin{array}{rcl} f\left(-\sqrt{3^9}\right) &=& \dfrac{-\sqrt{3^9}}{\sqrt{3}}+\sqrt[3]{3\cdot\left(-\left(\sqrt{3^9}\right)\right)^2}\cdot \sqrt[3]{3^2} \\ &=& -81+81 \\ &=& 0\end{array}