设α为第四象限角,其终边上的一个点是P(x,-
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),且cos α=
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x,求sin α和tan α.
考点分析:
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若α是第二象限角,其终边上一点
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如图所示,设点A是单位圆内的一定点,动点P从点A出发在圆上按逆时针方向旋转一周,点P所旋转过的弧
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A.
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B.
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C.
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D.
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已知角2α的顶点在原点,始边与x轴的非负半轴重合,终边经过点(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/0.png)
),且2α∈[0,2π),则tanα等于( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/1.png)
B.
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C.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123743429523833/SYS201310251237434295238004_ST/3.png)
D.
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