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From an aeroplane vertically over a stra...

From an aeroplane vertically over a straight horizontal road, the angles of depression of two consecutive kilometre-stones on the opposite sides of the aeroplane are observed to be `alpha and beta.` The height of the aeroplane above the road is

A

A)`( tan alpha + tan beta)/(tan alpha tan beta)`

B

B)`(tan alpha tan beta)/(tan alpha + tan beta)`

C

C)`(cot alpha cot beta)/(cot alpha + cot beta)`

D

D)`(cot alpha + cot beta)/(cot alpha cot beta)`

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