Which of the following holds goods for a...

Which of the following holds goods for any triangle ABC ?

`(cos A)/(a)+ (cos B)/(b) +(cos C)/(c )= (a^2+b^2+c^2)/(2abc)`

`(sinA)/(a)+(sinB)/(b)+ (sinC)/(c )=(3)/(2R)`

`(cosA)/(a)+(cosB)/(b)+ (cosC)/(c )=(a^2+b^2+c^2)/(abc)`

`(sin2A)/(a^2)+(sin2B)/(b^2)= (sin2C)/(c^2)`

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The correct Answer is:

A, B

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