Which of the following holds goods for a...

Which of the following holds goods for any tiangle ABC, a,b,c are the lengths of the sides R is circumradius (A) `(cosA)/a+(cosB)/b+(cosC)/c= (a^2+b^2+c^2)/(2abc)` (B) `(sinA)/a+(sinB)/b+(sinC)/c=3/(2R0` (C) `(cosA)/a=(cosB)/b=(cosC)/c` (D) `(sin2A)/a62=(sin2B)/b^2=(sin2C)/c^2`

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