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)`d/(cotalpha+cotbeta)` (b) `d/(cotalpha-cotbeta)` (c)`d/(tanbeta-t a nalpha)` (d) `d/(tanbeta+tanalpha)`

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