TeX Quellcode:

{\varphi = \arccos \left(\dfrac{-2^7 \cdot\left(-\frac{1}{2} \right) + \left(-7^3\right) \cdot 0 + 0 \cdot \sqrt{15}}{\sqrt{\left(-2^7\right)^2+\left(-7^3\right)^2+0^2} \cdot \sqrt{\left(-\frac{1}{2}\right)^2+ 0^2+\left(\sqrt{15}\right)^2}} \right) = \arccos \left(\dfrac{64}{\sqrt{134.033} \cdot \sqrt{15{,}25}} \right) \approx 87{,}43^{\circ}}