TeX Quellcode:

\begin{array}{rcl}f'_{xx}(x,y) &=& -1\left(x+y^2\right)^{-1-1}\cdot 1\\& & -2ye^{2xy}\cdot 2y\\\\&=& -\dfrac{1}{\left(x+y^2\right)^2}-4y^2e^{2xy}\end{array}