-> ^ ^ E = xEoCos(kz-wt)+yEoSin(kz-wt+¥õ)
Set Eo=10 , z=0 , w=1 , ¥õ=¥ð/2(=90¡Æ)
-> Polt E on xy-plane , Vanying to by ¡ât=¥ð/10
t=0 , ¥ð/10 , 2¥ð/10 , 3¥ð/10 , ...... , 2¥ð
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