1.

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 :

Answer»

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

ANSWER :C


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