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已知斜三棱柱ABC-A1B1C1,侧面ACC1A1与底面ABC垂直,∠ABC=90°,,且...
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已知斜三棱柱ABC-A
1B
1C
1,侧面ACC
1A
1与底面ABC垂直,∠ABC=90°,
,且AA
1⊥A
1C,AA
1=A
1C.
(1)试判断A
1A与平面A
1BC是否垂直,并说明理由;
(2)求侧面BB
1C
1C与底面ABC所成锐二面角的余弦值.
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