已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231554441718430/SYS201311012315544417184016_ST/0.png)
.
(1)若x∈R,求函数f(x)的单调区间;
(2)在答题卡所示的坐标系中画出函数f(x)在区间[0,π]上的图象.
考点分析:
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前10项的和为( )
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若△ABC的内角满足sinA+cosA>0,tanA-sinA<0,则角A的取值范围是( )
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直线l与直线y=1,直线x=7分别交于P,Q两点,PQ中点为M(1,-1),则直线l的斜率是( )
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已知集合M={x|y=2
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椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546141995979/SYS201311012315461419959020_ST/0.png)
(a>b>0)与直线x+y=1交于P、Q两点,且OP⊥OQ,其中O为坐标原点.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546141995979/SYS201311012315461419959020_ST/2.png)
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,求椭圆长轴的取值范围.
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