解答题-问答题 适中0.64 引用1 组卷378
如图,在圆锥
中,已知
,
的直径
,
是
的中点,
为
的中点.
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/6ecba19e39084e2f8852fd2dffff2c73.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/1f8177ff58874352b8da5365cdf0556d.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/f4263cc320dc463e92e08be5d980985a.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/4b6b301612444239881c723c31e5d251.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/c7d55c001b584ddb90907aeeb7aa505f.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/9aae893a6f2346ae9e4cc435a86ceaee.png)
(1)证明:平面
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/b99b3eef331a437ba818d8848c07c4bc.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/3c98c57635fb474c86f7718afce7ec3d.png)
(2)求二面角
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579070760419328/1579070761197568/STEM/526e6d9c28204ad098bd37e2e27a8658.png)
16-17高二·安徽池州·阶段练习
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