Answer
See image
Work Step by Step
If $(x,y)= (\pi/2,2)$ is on the graph, so is $(-x,-y)= (-\pi/2,-2)$
If $(x,y)= (\pi,0)$ is on the graph, so is $(-x,-y)= (-\pi,0)$
Join with smooth curve, mirroring the given part.
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