With usual notations, if in a triangleAB...

With usual notations, if in a `triangleABC (b+c)/(11)=(c+a)/(12)=(a+b)/(13)` , then prove that: `(cosA)/7=(cosB)/(19)=(cosC)/(25)`

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The correct Answer is:

`(cos A)/(7) =(cos B)/(19)=(cos C)/(25)`

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