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[" Mathematics - Helghts and Distances "],[" it.The angular clevation of tower CD at a point A due south of it is "60^(@)" and at a point "B" due west "],[" the clevation is "30^(@)" .If "AB=3km" ,the height of the tower is "],[qquad " 3) "(3sqrt(3))/(km)quad " 4) "(3sqrt(6))/(4)km]

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