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A vertical tower stands on a horizontal plane and is surmounted by a vertical flag staff of height h. At a point on the plane, the angle of elevation of the bottom of the flag staff is `alpha` and that of the top of the flag staff is `beta` . then the height of the tower is
एक ऊर्ध्वाधर मीनार एक क्षेतिज समतल पर खड़ी है और उसके ऊपर 1 ऊँचाई का ऊर्ध्वाधर ध्वजखण्ड लगा है। समतल पर एक बिन्दु पर ध्वजदण्ड के तल का उन्नयन कोण `alpha` है और ध्वजदण्ड के शीर्ष भाग का `beta` है। मीनार की ऊँचाई बताइए ?

A

`h tan alpha`

B

`(h tan alpha)/(tan beta-tan alpha)`

C

`(h tan alpha)/(tan alpha-tan beta)`

D

None of these

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