在△ABC中,已知cos
=
,则cos
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c9909ad25edf40b38392675567d472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e4c30981fd0794c8b8f2c21b7af6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eac5a0b4af9cbbe7c6a0b49e809416c.png)
更新时间:2021-04-03 16:48:34
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