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If O is the circum-centre of triangle AB...

If O is the circum-centre of triangle ABC and `R_1 , R_2 and R_3` respectively the radii of circumcircles of the triangles OBC, OCA and OAB, then `a/R_1 + b/R_2 + c/R_3=……..`

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The correct Answer is:
`(abc)/(R^3)`
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