1.在四棱锥P-ABCD中,底面ABCD是一个直角梯形,∠BAD=90度,AD//BC,AB=BC=a,AD=2a.且PA⊥平面ABCD,PD与底面成30度角.求异面直线AE与CD所成角的余弦值2.设圆上的点A(2,3)关于直线x+2y=0的对称点仍在圆上,且与直
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![1.在四棱锥P-ABCD中,底面ABCD是一个直角梯形,∠BAD=90度,AD//BC,AB=BC=a,AD=2a.且PA⊥平面ABCD,PD与底面成30度角.求异面直线AE与CD所成角的余弦值2.设圆上的点A(2,3)关于直线x+2y=0的对称点仍在圆上,且与直](/uploads/image/z/7944389-53-9.jpg?t=1.%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E6%98%AF%E4%B8%80%E4%B8%AA%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2%2C%E2%88%A0BAD%3D90%E5%BA%A6%2CAD%2F%2FBC%2CAB%3DBC%3Da%2CAD%3D2a.%E4%B8%94PA%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2CPD%E4%B8%8E%E5%BA%95%E9%9D%A2%E6%88%9030%E5%BA%A6%E8%A7%92.%E6%B1%82%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFAE%E4%B8%8ECD%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC2.%E8%AE%BE%E5%9C%86%E4%B8%8A%E7%9A%84%E7%82%B9A%282%2C3%29%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BFx%2B2y%3D0%E7%9A%84%E5%AF%B9%E7%A7%B0%E7%82%B9%E4%BB%8D%E5%9C%A8%E5%9C%86%E4%B8%8A%2C%E4%B8%94%E4%B8%8E%E7%9B%B4)
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