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

The angle of elevation of the top of a vertical tower from a point P on the horizontal ground was observed to be `alpha`. After moving a distance 2 meters from P towards the foot of the tower, the angle of elevation changes to `beta`. Then the height (in meters) of the tower is :

`(2sin alpha sin beta)/(sin(beta-alpha))`

`(sin alpha sin beta)/(cos(beta-alpha))`

`(2sin(beta-alpha))/(sin alpha sin beta)`

`(cos(beta-alpha))/(sin alpha sin beta)`

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