已知
的极坐标方程为:
.
(1)求圆
在直角坐标系中的圆心坐标,并选择合适的参数,写出圆
的参数方程;
(2)点
在圆
上,试求
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5eccf17f5d5fe936fb0d0e8b2694ce.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ed6e1ee7c08ed066589bfa550f41e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b280072b513099d6ca0f28119c650eb2.png)
更新时间:2016-12-04 03:32:09
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相似题推荐
解答题-问答题
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【推荐1】在平面直角坐标系
中,已知点
的坐标为
,直线
的方程为:
(其中
为参数).以坐标原点
为极点,
轴正半轴为极轴建立极坐标系,曲线
的极坐标方程为:
.
(1)将直线
的方程化为普通方程,曲线
的方程化为直角坐标方程;
(2)若直线
过点
且交曲线
于
,
两点,设线段
的中点为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094cba781181aeb90752170e9ba6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c303c71d57ac11fde4b58587f139856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfdd607b7ef8285fb5f55a6f2d9d0fe7.png)
(1)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f812a1810e10cda306a100d44fe27109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a92b933377ae3453fb36a171c521c7.png)
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【推荐2】(1)在极坐标系中,已知点
,请将
点的极坐标化为直角坐标;
(2)在平面直角坐标系中,求曲线
经过伸缩变换
后的曲线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ae348b88131bcb064eaa2cdb50954b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)在平面直角坐标系中,求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90af67e4c90e378ade7773722e805b59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e5643c2bdc7b11293fb0a2b3fe91ce.png)
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【推荐1】选修4-4:坐标系与参数方程
在极坐标系中,为极点,点
.
(1)求经过点的圆
的极坐标方程;
(2)以极点为坐标原点,极轴为的正半轴建立平面直角坐标系,圆
的参数方程为
(
是参数,
为半径),若圆
与圆
相切,求半径
的值.
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解题方法
【推荐2】在平面直角坐标系
中,直线l经过点
,其倾斜角是
.以原点O为极点,x轴的正半轴为极轴,与直角坐标系
取相同的长度单位建立极坐标系,设曲线C的极坐标方程是
.
(1)若直线l和曲线C有交点,求
的取值范围;
(2)设
为曲线C上任意一点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ba6d181338d6a7c477b8d9c4d4651f.png)
(1)若直线l和曲线C有交点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b134db43c6c869262259d202baf392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfb3efcdf3989e29185db8d886fb612.png)
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【推荐3】在直角坐标系xOy中,曲线C的参数方程为
为参数),直线l的参数方程为
(t为参数,0≤α<π).
(1)若曲线C与y轴负半轴的交点在直线l上,求α;
(2)若tanα=
,求曲线C上与直线l距离最大的点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16044de6ea5216516961911993bd595f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9423c63a5f60c54a2186958d53dd2bf6.png)
(1)若曲线C与y轴负半轴的交点在直线l上,求α;
(2)若tanα=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
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