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A flag staff of length 'd' stands on tow...

A flag staff of length 'd' stands on tower of height h. IF at a point on the ground the angle of elevation of the tower and top of the flag staff be `alpha, beta` then h=

A

`(d cot beta)/(cot alpha-cotbeta)`

B

`(dtanbeta)/(tanalpha-tanbeta)`

C

`[(tanalpha+tanbeta)/(cotalpha-cotbeta)]`

D

`(dtanalpha)/(tanbeta)`

Text Solution

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The correct Answer is:
A
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