[" In any "Delta ABC" ,prove that "],[(a-b)^(2)cos^(2)(C)/(2)+(a+b)^(2)sin^(2)(C)/(2)=c^(2)]

In Delta ABC , prove that (a - b)^(2) cos^(2).(C)/(2) + (a + b)^(2) sin^(2).(C)/(2) = c^(2)

In Delta ABC , prove that (a - b)^(2) cos^(2).(C)/(2) + (a + b)^(2) sin^(2).(C)/(2) = c^(2)

In Delta ABC prove that (a-b)^2 cos^2(C/2) + (a+b)^2 sin^2(C/2) = c^2

In Delta ABC , prove that (b - c)^(2) cos^(2) ((A)/(2)) + (b + c)^(2) sin^(2) ((A)/(2)) = a^(2) .

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

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

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

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