Long description
The graph is periodic about the x-axis. Vertical asymptotes are at x = negative pi over 2, x = 0, x = pi over 2, and x = 3 pi over 2. The period is the horizontal between asymptotes. A curve rises from each asymptote with decreasing steepness, inflects at the midpoint on the x-axis, then rises and approaches the next asymptote.
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