E_{Σ} = 2 E_{0} \cos (k z + \frac{δ_{E}}{2}) \sin (ω t + \frac{δ_{E}}{2})

${E_\Sigma = 2 E_0 \cos (kz + \frac{\delta_E}{2}) \sin (\omega t + \frac{\delta_E}{2})}$

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