在直角坐标系xOy中,曲线C的参数方程
(a为参数),以坐标原点为极点,以x轴的正半轴为极轴建立极坐标系.
(1)写出曲线C的普通方程和极坐标方程;
(2)设A,B是曲线C上的两点,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1f98fc361af6f2e8868904d189b597.png)
(1)写出曲线C的普通方程和极坐标方程;
(2)设A,B是曲线C上的两点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dcb4841ae7bb1d5f91837094cdfcf2c.png)
更新时间:2022-05-14 23:28:41
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【推荐1】在直角坐标系
中,圆
的的参数方程为
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为参数),圆
经过伸缩变换
得曲线
,以坐标原点为极点,
轴正半轴为极轴建立极坐标系.已知直线
经过极点和点
.
(1)求曲线
的极坐标方程与直线
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(2)设直线
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交于
,
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(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】.已知直线
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(2)由直线
上的点向圆引切线,求切线长的最小值.
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(1)求圆C在直角坐标系下的方程;
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【推荐1】在平面直角坐标系中,曲线
的参数方程为
(
为参数),以该直角坐标系的原点为极点,
轴的非负半轴为极轴建立极坐标系;曲线
的极坐标方程为
.
(Ⅰ)求
的极坐标方程;
(Ⅱ)
与
交于
,
两点,线段
中点为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】在平面直角坐标系
中,直线
的方程为
为参数
,曲线
经过伸缩变换
后得到曲线
.以
点为极点,
轴的非负半轴为极轴建立极坐标系.
(1)求直线
的极坐标方程和曲线
的普通方程;
(2)设射线
与直线
和曲线
分别交于点
,求
的最大值.
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(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设射线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐1】在直角坐标系
中,曲线
的参数方程为
(
为参数).以坐标原点为极点,
轴正半轴为极轴建立极坐标系,直线
的极坐标方程为
.
(1)求曲线
的极坐标方程;
(2)已知直线
与曲线
交于
,
两点,若
,求直线
的直角坐标方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f92e5e8960a482b182797af406584f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】[选修4-4:坐标系与参数方程]
在直角坐标系
中,点
,直线
的参数方程为
(
为参数),曲线
的参数方程为
(
为参数),以坐标原点为极点,
轴的正半轴为极轴建立极坐标系,已知曲线
的极坐标方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e1670a2c3622b8fad6f8757b1cd8e6.png)
,直线
与曲线
相交于
,
两点.
(1)求曲线
与直线
交点的极坐标(
,
);
(2)若
,求
的值.
在直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ec0c438427b2949077e2da074633d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1decaed3d9675fcf18ce699d91a571.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e1670a2c3622b8fad6f8757b1cd8e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417a7baca0753ba9ad45fe148d5d291c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2aa1a73e5520271405f20f520f47d57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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