(本小题满分12分)如图,三棱柱ABC—A1B1C1中,侧面ACC1A1是的菱形,且与底面ABC垂直,AC=CB=2,且AC⊥CB.
(Ⅰ)求证:AC1⊥面A1BC;
(Ⅱ)求直线A1B与面ABC所成角的正切值;
(Ⅲ)求二面角B—A1A—C的正切值.
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(本小题满分12分)如图,三棱柱ABC—A1B1C1中,侧面ACC1A1是的菱形,且与底面ABC垂直,AC=CB=2,且AC⊥CB.
(Ⅰ)求证:AC1⊥面A1BC;
(Ⅱ)求直线A1B与面ABC所成角的正切值;
(Ⅲ)求二面角B—A1A—C的正切值.