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

`3cotbeta-2cot gamma`

`3cot gamma-2cotbeta`

`3cotbeta-cot gamma`

`cotbeta-3cot gamma`

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