Multiple choice

If the electric field of a plane wave is ^{$\overrightarrow{E}$}(z, t) = x³ cos (wt - kz + 30^o) – y⁴ sin (wt - kz + 45^o) (mV/m), the polarization state of the plane wave is

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If the electric field of a plane wave is $\overrightarrow{E}$ (z, t) = x3 cos (wt - kz + 30o) – y4 sin (wt - kz + 45o) (mV/m), the polarization state of the plane wave is