Question: Shade Area/Region Between Polar Curve

with(plots);
P1 := plot([-sin(t), t, t = 0 .. 2*Pi], coords = polar, color = red);
P2 := plot([cos(t), t, t = 0 .. 2*Pi], coords = polar, color = blue);
display(P1, P2, scaling = constrained);
 

I have two polar equation in the same graph but how do i shade the region between those two polar curve?

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