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From the top of a light house, the angle...

From the top of a light house, the angles of depression of two stations on opposite sides of it at a distance a apart are `alpha` and `beta`. Find the height of the light house.

A

`a/(cot alpha cot beta)`

B

`a/(cot alpha + cot beta)`

C

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

D

`(a tan alpha tan beta)/(cot alpha + cot beta)`

Text Solution

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The correct Answer is:
B
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MCGROW HILL PUBLICATION-HEIGHTS AND DISTANCES -MULTIPLE CHOICE QUESTIONS
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