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已知A、B、C、D是平面上四个不共线的点,若,则△ABC的形状是( ) A.等腰...
已知A、B、C、D是平面上四个不共线的点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095858574498714/SYS201311030958585744987008_ST/0.png)
,则△ABC的形状是( )
A.等腰三角形
B.直角三角形
C.等腰直角三角形
D.等边三角形
考点分析:
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函数y=sin(πx+φ)(φ>0)的部分图象如图所示,设P是图象的最高点,A,B是图象与x轴的交点,则tan∠APB=( )
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在
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上单调递减.则ω的取值范围是( )
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