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

In DeltaABC , prove that: (b-c)/acos^(2)A/2+(c-a)/(b)cos^(2)B/2+(a-b)/(c ).cos^(2)C/2=0

in any triangle ABC prove that (b-c)/acos^2(A/2)+(c-a)/(b)cos^2(B/2)+(a-b)(/c)cos^2(C/2)=0

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

In any Delta ABC, prove that :a(b cos C-c cos B)=b^(2)-c^(2)

For any DeltaABC , prove that sin ((B-C)/2)=(b-c)/a cos (A/2)

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

In any DeltaABC , prove that : (cos^2(A/2))/a + (cos^2(B/2))/b + (cos^2(C/2))/c = s^2/(abc)

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

In any A B C , prove that: 2{b cos^2(C/2) + c cos^2(B/2)}=a+c+b

In any Delta ABC, prove that :(b+c)cos((B+C)/(2))=a cos((B-C)/(2))])