已知向量a=(3sin α,cos α),b=(2sin α,5sin α-4cos α),α∈
,且a⊥b.
(1)求tan α的值;
(2)求cos
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb4301bb0de39b5488624fc2e6abf61.png)
(1)求tan α的值;
(2)求cos
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c9550c7d25f7bf0f3ccb14cf184ba4.png)
2014高三·全国·专题练习 查看更多[2]
更新时间:2016-12-02 18:33:33
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