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A tower leans towards west making an ang...

A tower leans towards west making an angle `alpha` with the vertical. The angular elevation of B, the top most point of the tower is `beta` as observed from a point C due east of A at distance d from A. If the angular elevation of B from a point due east of C a distance 2d from C is `gamma` , " then " 2tan alpha` can be written as

A

`3cotbeta-2cotgamma`

B

`3cotgamma-2cotbeta`

C

`3cotbeta-cotgamma`

D

`cotbeta-3cotgamma`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-HEIGHTS AND DISTANCES-LECTURE SHEET Exercise-I (Straight Objective Type Questions)
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  17. The angle of elevation of a top of a tower from a point A due south of...

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