如图,在四棱锥P-ABCD中,底面为直角梯形,AB‖DC,∠DAB=90°,PA⊥底面ABCD,且PA=AD=DC=1/2AB=1,M是PB的中点,求AC与PB所成角求面AMC与面BMC所成二面角的余弦值 用立体几何姐w
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![如图,在四棱锥P-ABCD中,底面为直角梯形,AB‖DC,∠DAB=90°,PA⊥底面ABCD,且PA=AD=DC=1/2AB=1,M是PB的中点,求AC与PB所成角求面AMC与面BMC所成二面角的余弦值 用立体几何姐w](/uploads/image/z/8641219-67-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2%E4%B8%BA%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2%2CAB%E2%80%96DC%2C%E2%88%A0DAB%3D90%C2%B0%2CPA%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD%2C%E4%B8%94PA%3DAD%3DDC%3D1%2F2AB%3D1%2CM%E6%98%AFPB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82AC%E4%B8%8EPB%E6%89%80%E6%88%90%E8%A7%92%E6%B1%82%E9%9D%A2AMC%E4%B8%8E%E9%9D%A2BMC%E6%89%80%E6%88%90%E4%BA%8C%E9%9D%A2%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC+%E7%94%A8%E7%AB%8B%E4%BD%93%E5%87%A0%E4%BD%95%E5%A7%90w)
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