如图,三棱锥P-ABC中,PA⊥平面ABC,AB⊥BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/e9b10cbb-d59b-4578-a099-da44403bea5e.png?resizew=136)
(1)证明:平面PBC⊥平面PAB;
(2)若AB=BC=1,PA=2,M为棱PC的中点,求平面MAB与平面PAB夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/e9b10cbb-d59b-4578-a099-da44403bea5e.png?resizew=136)
(1)证明:平面PBC⊥平面PAB;
(2)若AB=BC=1,PA=2,M为棱PC的中点,求平面MAB与平面PAB夹角的余弦值.
更新时间:2023-02-01 13:07:10
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解答题-证明题
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