E
(
z
,
t
)
=
E
0
sin
(
ω
t
−
k
z
)
=
E
0
sin
(
ω
t
+
ϕ
)
E
(
z
,
t
)
=
E
0
sin
(
ω
t
−
k
z
)
=
E
0
sin
(
ω
t
+
ϕ
)
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