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In this video I will explain the 1-D wave equation of u(x,t)=Acos(kx-wt) with a phase angle phi such that the 1-D wave equation becomes u(x,t)=Acos(kx-wt+phi) with will become a standing wave equation.

Next video in this series can be seen at:
https://youtu.be/jUUA-9ZFixI