圆O1ρ=4cosθ ρ²＝4ρcosθ ρ²＝x²﹢y² ρcosθ＝xx²﹢y²＝4x (x-2)²+y²=4圆O2ρ=-sinθ ρ²＝-ρsinθ x²﹢y²＝-y x²+(y+1/2)²=1/4经过圆O1与O2交点的直线：x²﹢y²＝4x x²﹢y²＝-y -y=4x 4x+y=0
