双曲线的切点弦shuangquxian de qiedianxian
自
| 双曲线 |
| 内部 (适合 |
| 的点组成的 |
| 切点弦P1P2所在的直线方程是 |
切点弦所在直线的方程在形式上和过双曲线上一点的切线方程一样，但意义却不同，当点P0位于双曲线上时，切点弦即与切线重合.
- oratory
- orbit
- orbital
- orb weaver
- Orcagna，Andrea
- orchestra
- orchid
- orchil
- Orchis
- orchitis
- Orczy，Baroness Emmusca
- Order in Council
- Order of Merit
- Order of the British Empire
- Order of the Hospital of St John of Jerusalem
- orders of archhitecture
- Ordinance of 1787
- Ordnance Survey
- Ordovician period
- Ordzhonikidza
- ore
- Orebro
- oregano
- Oregon
- Oregon Trail