若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227030530/SYS201311031023012270305012_ST/0.png)
,则cosα+sinα=
.
考点分析:
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设函数f(x)是定义在R上的奇函数,且对任意x∈R都有f(x)=f(x+4),当 x∈(-2,0)时,f(x)=2
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227030530/SYS201311031023012270305011_ST/0.png)
B.
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C.2
D.-2
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已知{a
n}为等差数列,a
1+a
3+a
5=105,a
2+a
4+a
6=99,以S
n表示{a
n}的前n项和,则使得S
n达到最大值的n是( )
A.21
B.20
C.19
D.18
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把函数
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B.
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C.
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D.
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若△ABC的三个内角满足sinA:sinB:sinC=5:11:13,则△ABC( )
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C.一定是钝角三角形
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已知α为第四象限的角,且
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=( )
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D.
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