O is the circumventer of the triangle ABC and \[{{R}_{1}},{{R}_{2}},{{R}_{3}}\] are the radii of the circumcircles of the triangles OBA, OCA and OAB respectively, then \[\frac{a}{{{R}_{1}}}+\frac{b}{{{R}_{2}}}+\frac{c}{{{R}_{3}}}\] is equal to

O is the circumventer of the triangle ABC and \[{{R}_{1}},{{R}_{2}},{{

1.	O is the circumventer of the triangle ABC and \[{{R}_{1}},{{R}_{2}},{{R}_{3}}\] are the radii of the circumcircles of the triangles OBA, OCA and OAB respectively, then \[\frac{a}{{{R}_{1}}}+\frac{b}{{{R}_{2}}}+\frac{c}{{{R}_{3}}}\] is equal to
A.	\[\frac{abc}{R}\]
B.	\[\frac{abc}{{{R}^{3}}}\]
C.	\[\frac{abc}{{{R}^{4}}}\]
D.	None
Answer» C. \[\frac{abc}{{{R}^{4}}}\]

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O is the circumventer of the triangle ABC and \[{{R}_{1}},{{R}_{2}},{{R}_{3}}\] are the radii of the circumcircles of the triangles OBA, OCA and OAB respectively, then \[\frac{a}{{{R}_{1}}}+\frac{b}{{{R}_{2}}}+\frac{c}{{{R}_{3}}}\] is equal to

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