1.

PQ is a vertical tower and A, B, C are three points on a horizontal line through Q, the foot of the tower and on the same side of the tower. If the angles of elevation of the top of the tower from A, B and C are alpha, beta, gamma respectively, then AB/BC =

Answer»

`(COT alpha-cot GAMMA)/(cot beta - cot gamma)`
`(cot alpha - cot beta)/(cot beta - cot gamma)`
`(cot alpha - cot beta)/(cot alpha - cot gamma)`
`(cot alpha - cot gamma)/(cot alpha - cot beta)`

ANSWER :B


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