In `Delta ABC` prove that `cos^2(A/2)+cos^2(B/2)+cos^2(C/2)=2+r/(2R)`

In DeltaABC" prove that "cos^(2).(A)/(2)+cos^(2).(B)/(2)+cos^(2).(C)/(2)=2+(r)/(2R)

In Delta ABC prove that cos ec(A)/(2)cos ec(B)/(2)cos ec(C)/(2)>=6

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

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

Prove that a cos^(2)(A/2)+b cos^(2)(B/2)+c cos^(2)(C/2)=s+(Delta)/(R)

In any Delta ABC, prove that: (cos^(2)((A)/(2)))/(a)+(cos^(2)((B)/(2)))/(b)+(cos^(2)((c)/(2)))/(c)=(s^(3))/(abc)

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

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 Delta ABC, prove that (cos 2A)/(a^(2))-(cos 2C)/(c^(2)) = (1)/(a^(2)) - (1)/(c^(2))