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

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 :a(b cos C-c cos B)=b^(2)-c^(2)

In DeltaABC , prove that: (bcos^(2)C)/2+(c cos^(2)B)/2=s

In any ABC, 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))])

In any DeltaABC , prove that a(bcosC-c cosB)=(b^(2)-c^(2))

In any DelataABC prove that "a(cos C - cos B)=2(b-c)cos"^(2)A/2

In DeltaABC , prove that: (b+c)cos(B+C)/(2)=acos(B-C)/(2)

In any DeltaABC , prove that 4(bc cos^(2)""A/2+ca cos^(2)""B/2+ab cos^(2)""C/2)=(a+b+c)^(2)

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