1 . 平面直角坐标系内一条直线经过点
,则一条射线初始位置与x轴正半轴重合,绕着原点逆时针旋转至第一次与这条直线平行时,旋转过的角大小为多少,用反三角函数表示?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dcdb9cee97cdc976e894dc8be1508ce.png)
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2 . 如图所示,直线
,
,
都经过点
,又
,
,
分别经过点
,
,
,试计算直线
,
,
的斜率,并判断这些直线的倾斜角是锐角、钝角还是零度角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9a3ea5e76e165faeabfdbc9717c287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8ecb68ec8db577e0d7fa6f85f760a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b22856350c38c4b0271063edb785bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7225750a8f3bc8450bec494c1d939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708887665459200/2814315928141824/STEM/01584f57-7055-4e7f-8f6f-2259886d351c.png?resizew=344)
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