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解题方法
1 . 已知
,
为锐角,
,
,则
的值为________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ef621a4cd31fddac154c86247dc0c0.png)
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2016-12-04更新
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6卷引用:辽宁省阜新市阜蒙二高2017-2018学年高一下学期期中考试数学试题