已知三棱锥P–ABC中,PB⊥平面ABC,∠ABC=60°,PB=AB=BC=6,则二面角C–PA–B的平面角的余弦值是?
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![已知三棱锥P–ABC中,PB⊥平面ABC,∠ABC=60°,PB=AB=BC=6,则二面角C–PA–B的平面角的余弦值是?](/uploads/image/z/3710498-50-8.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E6%A3%B1%E9%94%A5P%E2%80%93ABC%E4%B8%AD%2CPB%E2%8A%A5%E5%B9%B3%E9%9D%A2ABC%2C%E2%88%A0ABC%3D60%C2%B0%2CPB%3DAB%3DBC%3D6%2C%E5%88%99%E4%BA%8C%E9%9D%A2%E8%A7%92C%E2%80%93PA%E2%80%93B%E7%9A%84%E5%B9%B3%E9%9D%A2%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E6%98%AF%3F)
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