TeX Quellcode:

\begin{array}{cclcrcl}\quad\mathbb{D} &=& \mathbb{R}\setminus_{\{k\pi+\frac{\pi}{2}; k \in \mathbb{Z}\}} \\\\f(s) &=& -\tan(s)\left(\dfrac{s}{\pi}+\cos(s)\right) \\\\\quad u(s) &=& -\tan(s) &\Rightarrow & u'(s)&=& -\dfrac{1}{\cos^2(s)} \\\quad v(s) &=& \dfrac{1}{\pi}s+\cos(s) &\Rightarrow & v'(s) &=& \dfrac{1}{\pi}-\sin(s) \\\\f'(s) &=& -\dfrac{1}{\cos^2(s)}\cdot \left(\dfrac{s}{\pi}+\cos(s)\right) -\tan(s)\cdot \left(\dfrac{1}{\pi}-\sin(s)\right)\end{array}