Stehende Welle

\begin{aligned} A(x, t) = A_1(x, t) + A_2(x, t) \end{aligned}

\begin{aligned} \text{einlaufende Welle:} \;\; & A_1(x, t) = A_1^0\sin \left(\frac{2\pi x}{\lambda} - \frac{2\pi t}{T} \right) \\ \text{zurücklaufende Welle:} \;\; & A_2(x, t) = A_2^0\sin \left(\frac{2\pi x}{\lambda} + \frac{2\pi t}{T} \right) \\ \end{aligned}