已知函数
,点
为坐标原点, 点
,向量
,
是向量
与
的夹角,则
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4001cbe844b49d2a7495d94c3d917b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe182613ac06fac106410300118df1dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af3d2f631918625ee7b943e93a4f5c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9fd732824a62650f4021b667170e744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
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更新时间:2018-02-07 21:16:27
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