直线L与极轴角π/3 极轴和直线形成的三角形中ρ/sin(π/3)=2/sin[π-π/3-(π/6-θ)]ρ=√3/cosθ,ρcosθ=√3或ρ/sin(π-π/3)=2/sin[π-(π-π/3)-(θ-π/6)]ρ=√3/cosθ,ρcosθ=√3所求直线方程为ρcosθ=√3
