TeX Quellcode:

\begin{array}{rcl} f\left(\dfrac{5}{11}\right) &=& \sqrt{104\cdot\left(\dfrac{5}{11}\right)^2+36}-\sqrt{225\cdot\left(\dfrac{5}{11}\right)^2+11}\\ &=& \sqrt{\dfrac{6.956}{121}}-\sqrt{\dfrac{6.956}{121}}\\ &=& 0\end{array}