已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100958732890912/SYS201311031009587328909011_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100958732890912/SYS201311031009587328909011_ST/1.png)
,则tan2x=
.
考点分析:
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