在四棱锥P-ABCD中,底面ABCD为矩形,侧棱PA⊥底面ABCD,AB=根号3,BC=1PA=2,则直线AC与PB所成角的余弦值为
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![在四棱锥P-ABCD中,底面ABCD为矩形,侧棱PA⊥底面ABCD,AB=根号3,BC=1PA=2,则直线AC与PB所成角的余弦值为](/uploads/image/z/10035915-51-5.jpg?t=%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E4%B8%BA%E7%9F%A9%E5%BD%A2%2C%E4%BE%A7%E6%A3%B1PA%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD%2CAB%3D%E6%A0%B9%E5%8F%B73%2CBC%3D1PA%3D2%2C%E5%88%99%E7%9B%B4%E7%BA%BFAC%E4%B8%8EPB%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E4%B8%BA)
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