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Problem
Problem
If
θ
∈
[
0
,
3
π
]
\theta \in [0, 3\pi]
θ
∈
[
0
,
3
π
]
and
r
∈
R
r \in \mathbb{R}
r
∈
R
. Then, find the pairs of
(
r
,
θ
)
(r, \theta)
(
r
,
θ
)
satisfying
2
sin
θ
=
r
4
−
2
r
2
+
3
2 \sin \theta = r^4 - 2r^2 + 3
2
sin
θ
=
r
4
−
2
r
2
+
3
.
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