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[" In a triangle ABC,prove that for any angle "theta,b cos(A-b)+a" then prove that "(cos A)/(7)=(cos B)/(19)=(cos C)/(25)" ."],[" With usual notations,if in a "Delta BC,(b+c)/(11)=(c+a)/(12)=(a+b)/(13)" ,then prove that "(cos A)/(7)=(cos B)/(19)=(cos C)/(25)" ."]

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With usual notatins, if in a Delta ABC,(b+c)/(11)=(c+a)/(12) =(a+b)/(13), then prove that (cos A)/(7) =(cos B)/(19) =(cos C)/(25).

With usual notatins, if in a Delta ABC,(b+c)/(11)=(c+a)/(12) =(a+b)/(13), then prove that (cos A)/(7) =(cos B)/(19) =(cos C)/(25).

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

With usual notion,if in triangle ABC ,(b+c)/(11)=(c+a)/(12)=(a+b)/(13), then prove that (cos A)/(7)=(cos B)/(19)=(cos C)/(25)

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)

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)

In a triangle ABC, prove that for any angle theta,b cos(A-theta)+a cos(B+theta)=C cos theta

In the triangle ABC, if (b+c)/11 = (c+a)/12 = (a+b)/13 , prove that (cos A)/7 = (cos B)/19 = (cos C)/25 .

In a triangle ABC, prove that for any angle theta, b cos (A - theta) + a cos (B + theta) = C cos theta .

With usual notations, if in a triangle ABC (b+c)/(11) = (c+a)/(12) = (a+b)/(13) , then cos A : cos B : cos C is :