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在Rt△ABC中,∠C=90°,∠A=∠B,则cosA的值是( ) A. B. ...
在Rt△ABC中,∠C=90°,∠A=∠B,则cosA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202805278/SYS201311031014582028052026_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202805278/SYS201311031014582028052026_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202805278/SYS201311031014582028052026_ST/2.png)
D.1
考点分析:
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中,无理数有( )个.
A.1
B.2
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如果∠A是正三角形的一个内角,那么sinA的值等于( )
A.
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B.
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C.
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D.1
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下列各式中不成立的是( )
A.sin
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tan30°•cot30°的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202805278/SYS201311031014582028052022_ST/0.png)
B.3
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在△ABC中,∠C=90°,若∠A=60°,则sinA+cosB的值等于( )
A.
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B.
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C.
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D.
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