Phương trình sóng tại điểm M:
\(u_M=2A\cos\begin{bmatrix}\dfrac{\pi(d_2-d_1)}{\lambda}+\dfrac{\varphi_2-\varphi_1}{2} & \end{bmatrix}.\cos\begin{bmatrix} \omega t-\dfrac{\pi(d_1+d_2)}{\lambda}+\dfrac{\varphi_1+\varphi_2}{2}& \end{bmatrix}\)
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