The angle of elevation of the top of a t...

The angle of elevation of the top of a tower standing on a horizontal plane from a point A is alpha. After walking a distance d towards the foot of the tower the angle of elevation is found to be beta. The height of the tower is____

`(d)/(tan beta + tan alpha)`

`(d)/(tan beta - tan alpha)`

`(d)/(cot beta + cot alpha)`

`(d)/(cot alpha - cot beta)`

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UNITED BOOK HOUSE-Application of Trigonnometric Ratios : Heights of Distance-Exercise

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