O is the circumcentre of the triangle AB...

O is the circumcentre of the triangle `ABC and R_1,R_2,R_3` are the radii of the circumcirclesof the triangles `OBC, OCA and OAB` respectively, then `a/R_1+b/R_2+c/R_3` , is equal to

`(abc)/R`

`(abc)/(2R)`

`(abc)/(4R^(3))`

`(abc)/(R^(3))`

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