TeX Quellcode:

\begin{array}{rcccl}\dfrac{y^4-16}{2y^4-16y^2+32} &=& \dfrac{ \left(y^2-4 \right) \left(y^2+4 \right)}{2\left(y^2-4 \right)^2} &=& \dfrac{y^2+4}{2\left(y^2-4\right)}\end{array}