Module 3.6 Phase Velocity and Group Velocity
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ω0 = (Grad/s) β0 = (rad/m)

Parameters:

ω0: Angular frequency

β0: Phase constant

Blue curve: cos[(ω0+0.5*Δω)t - (β0+0.5*Δβ)z]  +  cos[(ω0-0.5*Δω)t - (β0-0.5*Δβ)z]

Red dashed curve: Envelope of the combined wave