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The following equation describes a wave due to the interference of two waves with the same...

The following equation describes a wave due to the interference of two waves with the same amplitude and wave number, but offset by a phase difference ϕ.

D(x,t)=2A cos(ϕ/2)sin(kx−ωt+ϕ/2)

What is the phase difference if the amplitude of the resultant wave is A?

A. π/6
B. π/4
C. π/3
D. π/2
E. 2π/3
F. π
G. 2π

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