TeX Quellcode:

\begin{array}{rcl}f'_{yy}(x,y) &=& 2\cdot \left(x+y^2\right)^{-1}+2y\cdot(-1)\left(x+y^2\right)^{-1-1}\cdot 2y\\& & -0\cdot e^{2xy}-2xe^{2xy}\cdot 2x\\\\&=& \dfrac{2}{x+y^2}-\dfrac{4y^2}{\left(x+y^2\right)^2}-4x^2e^{2xy}\end{array}