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取A1C1的中點D1,連接BD1,AD1, 在正三棱柱ABC-A1B1C1中,BD1⊥C1A1, 則∠B1AD1是AB1與側面ACC1A1所成的角, ∵正三棱柱ABC-A1B1C1的側棱長與底面邊長相等, ∴sin∠B1AD1=√6/4,
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