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已知tanθ=,则cos2θ+sin2θ=( ) A.- B. C. D.
已知tanθ=
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,则cos
2θ+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374510447/SYS201311012259343745104007_ST/1.png)
sin2θ=( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374510447/SYS201311012259343745104007_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374510447/SYS201311012259343745104007_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374510447/SYS201311012259343745104007_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374510447/SYS201311012259343745104007_ST/5.png)
考点分析:
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