A tower subtends an angle alpha at a poi...

A tower subtends an angle `alpha` at a point A on the same level as the foot of the tower B is a point vertically above A and AB = h metres. The angle of depression of the foot of the tower from B is `beta`. The height of the tower is

`l tan alpha cot beta`

`l tan beta cot alpha`

`l tan alpha cot beta`

`l tan alpha tan beta`

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