如图,ABCDA1B1C1D1是四棱柱,AA1⊥底面ABCD AB‖CD AB⊥AD,AD=CD如图,ABCDA1B1C1D1是四棱柱,AA1⊥底面ABCD AB‖CD AB⊥AD,AD=CD=AA1=1 AB=2求平面A1BD与平面BCC1B1所成二面角的大小. (不能用向量方法作答)
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