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With usual notations, if in a triangle A...

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

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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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In triangleABC (b+c)/11=(c+a)/12=(a+b)/13 then prove that (cosA)/7=(cosB)/19=(cosC)/25