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

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

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

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

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

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