1.

Three poles of height a, b, c stand on the same side of a road and subtend an angle of 45^(@) at a point on the line joining their feet. The pole of height a subtends an angle alpha at the foot of the pole of height b which subtends an angle beta at the foot of the pole with height c, if a gt b gt c, then cot alpha - cot beta =

Answer»

`(ac-b^(2))/(AB)`
`(BC-a^(2))/(ab)`
`(ab-c^(2))/(bc)`
`(ac-b^(2))/(bc)`

ANSWER :A


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