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[" If in the triangle "ABC,O" is the cir...

[" If in the triangle "ABC,O" is the circumcentre and "R" is the circumradius and "R_(1),R_(2),R_(3)" are the circumradii "],[" of the triangles "OBC," OCA and "OAB" respectively,then prove that "(a)/(R_(1))+(b)/(R_(2))+(c)/(R_(3))=(abc)/(R^(3))]

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