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A vertical tower stands on a horizontal plane and surmounted by a flagstaff of height 'h'. At a point on the plane. The angle of elevation of bottom of the flagstaff is `alpha` and that of the top of the flagstaffis `beta`. Find the height of the tower :

A

`h tanalpha`

B

`(h tanalpha)/(tanalpha-tanbeta)`

C

`(h tanalpha)/(tanbeta-tanalpha)`

D

`(tanalpha+tanbeta)/(h tanalpha)`

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The correct Answer is:
C
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