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【简答题】
如图，已知三棱柱 的侧棱与底面垂直， ⊥AC，M是 的中点，N是BC的中点，点P在直线 上，且满足 . （1）当 取，直线PN与平面ABC所成的角 最大？ （2）若平面PMN与平面ABC所成的二面角为 ，试确定点P的位置.
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