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As shown in the figure, a plane simple harmonic propagates in the positive direction of the x-axis. Knowing that the vibration
equation of point Py = Acos(wt+6) is the expression of the wave is
U
P
X
OA
y = Acos{ w[t] +
] +0}
-
B.
y = Acos { w[t_*+¹] +9}
OC
y = Acos{ w[t+¹=1+ø}
D
y = Acos { w[t+*+¹1+0}
U

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