Suppose that two sinusoidal waves with the same amplitude and frequency, moving in the positive $\hat{x}$ direction, overlap in a certain region of space and time. The wavelength of both waves is $\lambda = 24 \text{ cm}$. Because these two waves inhabit the same region of space and time, they will interfere. Figure 1 depicts the wave resulting from the interference of these two waves at time $t = 0$, as a function of position $x$.

What is the phase difference $\phi$ between the two waves?

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