the angle of elevation of the top of a tower standing of an horizontal plane from a point is alpha after Walker a distance d towards foot of the tower the angle of elevation is found to be beta then the height of the tower is
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The angle of elevation of the top of a tower standing on a horizontal plane from a point A is α. After walking a distance 'd' towards the foot of the tower the angle of elevation is found to be β. The height of the tower is
A. dcotα+cotβ
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