TeX Quellcode:

\begin{array}{rcl}g'_{yy}(x,y) &=& -\dfrac{7}{10}\cos(x)\cdot(-2)y^{-2-1}+0\\\\&=& \dfrac{7}{5}\cos(x)\cdot y^{-3}\\\\&=&\dfrac{7\cos(x)}{5y^3}\end{array}