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[" A vertical tower stands on a horizont...

[" A vertical tower stands on a horizontal plane and is surrounted by a vertical flag staff of height h.At a point on "],[" the plane,the angles of elevation of the bottom and the top of the flag staff are "alpha" and "beta" respectively.Prove that "],[" the height of the tower is "((h tan alpha)/(tan beta-tan alpha))]

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