ρˆ2-(1+2cosθ)ρ+2cosθ=0 => (ρ - 2cos θ)(ρ- 1) = 0 => ρ = 2cos θ 或者 ρ = 1.ρ = 2cos θ 化为直角坐标为：√(x^2 + y^2) = x / √(x^2 + y^2) => (x - 1)^2 + y^2 = 1这是圆心在(1,0) 半径为1的...