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If the electric field of a plane wave is $$\overrightarrow{E}(z,t)= \hat{x}3 \cos(\omega t-kz+30^{\circ}) – \hat{y} 4 \sin(\omega t – kz+45^{\circ}) (mV/m),$$ the polarization state of the plane wave is

  1. left elliptical
  2. left circular
  3. right elliptical
  4. right circular
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