28. A vertical tower stands on a horizontal plane and is surmounted by – InterviewSolution

1.	28. A vertical tower stands on a horizontal plane and is surmounted by a vertical flag-staff of heighit h. At apoint on the plane, the angles of elevation of the bottom and the top of the flag-staff are a andb respectively. Prove that the height of the tower isl (h tana)/(tanb -tanal]
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