TeX Quellcode:

\begin{array}{rcl} f'_{yz}(x,y,z) &=& \left(-3x^2y^2+2xy\right) e^{-3xy}\cdot\dfrac{1}{z} \\\\&=& \dfrac{-3x^2y^2+2xy}{z}e^{-3xy} \\\\\end{array}