[" 38.If any triangle "ABC" ,the "],[" simplified form of "],[(cos2A)/(a^(2))-(cos2B)/(b^(2))" is "]

If any triangle A B C, the simplified form of (cos 2 A)/(a^(2))-(cos 2 B)/(b^(2)) is

In Delta ABC,(cos 2A)/(a^2) - (cos2B)/(b^2) = ......

In a triangle ABC the maximum value of (a cos^(2)A//2 +b cos^(2)B//2+cos^(2)C//2)/(a+b+c) is

In any triangle ABC, the valur of a (cos ^(2) B+ cos ^(2)C)+ cos A (b cos B+ c cos C) is-

ln Delta ABC,b^(2)cos2A-a^(2)cos2B=

For any triangle ABC, prove that (cos A)/(a)+(cos B)/(b)+(cos C)/(c)=(a^(2)+b^(2)+c^(2))/(2abc)

In any triangle ABC, prove that: (1+cos(A-B)cos C)/(1+cos(A-C)cos B)=(a^(2)+b^(2))/(a^(2)+c^(2))

For any triangle ABC, prove that : (b+c)cos((B+C)/(2))=acos((B-C)/(2))

In any triangle ABC, prove that a cos A+b cos B +c cos C =(8 triangle^(2))/(abc) .

In any triangle ABC, prove that following: (cos^(2)B-cos^(2)C)/(b+c)+(cos^(2)C-cos^(2)A)/(c+a)+(cos^(2)A-cos^(2)B)/(a+b)=0