若
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,
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,则tanα=
.
考点分析:
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如图,已知线段
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,但点A沿着以原点O为圆心的单位圆上运动时,点B在x轴上滑动.设∠AOB=θ,记x(θ)为点B的横坐标关于θ的函数,则x(θ)在
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上的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230411415041017/SYS201311012304114150410009_ST/images2.png)
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230411415041017/SYS201311012304114150410009_ST/images5.png)
D.
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已知f(x)=Asin(ωx+φ)(A>0,ω>0,0<φ<π),其导函数f′(x)的图象如图所示,则.f(π)的值为( )
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A.
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B.
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C.2
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D.2
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已知A(-3,0)、B(0,2),O为坐标原点,点C在第二象限内,且∠AOC=45°,设
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,则λ的值为( )
A.1
B.
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C.
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D.
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张晓华同学骑电动自行车以的速度沿着正北方向的公路行驶,在点A处望见电视塔S在电动车的北偏东30°方向上,15min后到点B处望见电视塔在电动车的北偏东75°方向上,则电动车在点B时与电视塔S的距离是( )
A.2
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B.3
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C.3
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km
D.2
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km
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230411415041017/SYS201311012304114150410005_ST/0.png)
且
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,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230411415041017/SYS201311012304114150410005_ST/2.png)
|=( )
A.-1O
B.10
C.-
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D.
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