计算:cos60°•cos30°-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765557707/SYS201310221648187655577018_ST/0.png)
sin30°•tan60°+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765557707/SYS201310221648187655577018_ST/1.png)
.
考点分析:
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