Translations:Sinusoidal waves/55/en

${\begin{aligned}{\rm {\ sin\ }}\left(k\left(x-vt\right)\right)&{\rm {=\ sin\ }}\left(k\left(x\pm \lambda -vt\right)\right){\rm {=\ sin\ }}\left(k\left(x-vt\right)\pm k\lambda \right).\end{aligned}}$

(13)