1.

Two circular path of radii a and b intersect at a point O and AB is a line through O meeting the circles at A and B respectively. Chords OA and OB subtend equal angles of 60^(@) at their respective centres. A vertical pole at O subtends angles alpha and beta respectively at A and B then height of the pole is

Answer»

`a COT alpha`
`B cot BETA`
`(a + b)/(cot alpha + cot beta)`
NONE of these

Answer :C


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