解析：
ρ²=4/(1+3sinθ)
4/ρ²=1+3sinθ
4/ρ²-1=3sinθ
(4/ρ²-1)²=9sin²θ
(4/ρ²-1)²ρ⁴=9sin²θρ²●ρ²
(4-ρ²)²=9(ρsinθ)²●ρ²
(4-x²-y²)²=9y²(x²+y²)
ρ²=4/(1+3sinθ)
4/ρ²=1+3sinθ
4/ρ²-1=3sinθ
(4/ρ²-1)²=9sin²θ
(4/ρ²-1)²ρ⁴=9sin²θρ²●ρ²
(4-ρ²)²=9(ρsinθ)²●ρ²
(4-x²-y²)²=9y²(x²+y²)
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