Q .     From the top of a hill `h` metres high the angles of depressions of the top and the bottom of pillar are `alpha` and `beta` respectively. The height (in metres) of the pillar is

BITSAT 2008
A

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

B

`(h tan beta- tan alpha)/(tan^2 beta)`

C

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

D

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

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