如何优雅证明椭圆焦点三角形 Pf₁f₂ 的面积等于 B²tanα2？ 知乎 Sketch Coloring Page

如何优雅证明椭圆焦点三角形 Pf₁f₂ 的面积等于 B²tanα2？ 知乎 Template

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