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1 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c240210017e1c6318453967a199d06e4.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8013f2bc34a7b81965339593dd1a49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c240210017e1c6318453967a199d06e4.png)
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2 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
__________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
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3 . 在平面直角坐标系
中,锐角
顶点在坐标原点,始边为x轴正半轴,终边与单位圆交于点
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617323ce4cf55d63f7bf9ba2de289b0e.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知角
的终边落在射线
上,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
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