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Mathematics
Mathematics
Problem
At
θ
=
π
4
\theta=\frac{\pi}{4}
θ
=
4
π
for the curve
r
=
1
+
sin
θ
r=1+\sin\theta
r
=
1
+
sin
θ
, indicate whether the graph is concave up or concave down in the Cartesian plane.
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