TeX Quellcode:

\begin{array}{rcl} f'_{yz}(x,y,z) &=& 35\pi xy^4\cos\left(7y^5\right)e^{-10xz-1}\cdot (-10x) \\\\ &=& -350\pi x^2y^4\cos\left(7y^5\right)e^{-10xz-1} \\\\&=& -\dfrac{350\pi x^2y^4\cos\left(7y^5\right)}{e^{10xz+1}}\end{array}