摘要: 曲线与曲线的 ( ) A.长轴长相等 B.短轴长相等 C.焦距相等 D.离心率相等
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B.(几何证明选做题)如图,四边形ABCD是圆O的内接四边形,延长AB和DC相交于点P.若
| PB |
| PA |
| 1 |
| 2 |
| PC |
| PD |
| 1 |
| 3 |
| BC |
| AD |
C.(坐标系与参数方程选做题)设曲线C的参数方程为
|
| 2 |
| cosθ-sinθ |
| 2 |
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| PB |
| PA |
| 1 |
| 2 |
| PC |
| PD |
| 1 |
| 3 |
| BC |
| AD |
|
| 2 |
| cosθ-sinθ |
| 2 |