the angles of elevation of the bottom and the top of the flag staff are α and β

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A vertical tower stands on a horizontal plane and is surmounted 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 α and β , respectively. Prove that the height of the tower is ( h tanα /tanβ−tanα)
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Nov
A vertical tower stands on a horizontal plane and is surmounted 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 α and β , respectively. Prove that the height of the tower is ( h [...]
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Tags: A vertical tower stands on a horizontal plane and is surmounted by a vertical flag staff of height h. At a point on the plane , respectively. Prove that the height of the tower is ( h tanα /tanβ−tanα) , the angles of elevation of the bottom and the top of the flag staff are α and β ,