The description of the graph you provided suggests that the function has vertical asymptotes at multiples of π and alternates between upward-facing and downward-facing curves. This behavior is consistent with the function \( y = tan \theta \).
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Vertical Asymptotes: The function \( y = tan \theta \) has vertical asymptotes at \( \theta = \frac{\pi}{2} + n\pi \) for integers \( n \), which corresponds to multiples of π.
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Graph Behavior: The upward-facing curves of \( y = tan \theta \) go from negative infinity to positive infinity, and the downward-facing curves do the opposite. This behavior matches your description of how the values alternate.
Given this analysis, the function represented in the graph is most likely:
y = tan θ