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$$\vec{E} = \vec{E_0} \cos(\vec{k} \cdot \vec{r} - \omega t)$$
$$\vec{B} = \vec{B_0} \cos(\vec{k} \cdot \vec{r} - \omega t)$$
Sinusoidal oscillation of fields, where $$\vec{k}$$ is wave vector, $$\vec{r}$$ is position, $$\omega$$ is angular frequency, and $$t$$ is time.
