https://changzh.me/tags/%E5%9C%86%E9%94%A5%E6%9B%B2%E7%BA%BF/Recent content in 圆锥曲线 on Blog of BrianHugozh-CNSun, 04 Oct 2026 17:24:00 +0800https://changzh.me/posts/conic-tangent-substitution/Sun, 04 Oct 2026 17:24:00 +0800https://changzh.me/posts/conic-tangent-substitution/从圆的切线出发，通过保持切点处的值、让微分按同一比例变化，逐步推导椭圆、双曲线、抛物线及一般二次曲线的切线公式。