In a triangle `Delta ABC`, prove the following :
`2 abc cos.(A)/(2) cos.(B)/(2) cos.(C )/(2) = (a+b+c)Delta`

Prove that : (abc)/(s) cos (A)/(2) cos (B)/(2) cos (C )/(2) = triangle .

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

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

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

In any Delta ABC, prove the following: (a+b+c)(cos A+cos B+cos C)=2((a cos^(2))(1)/(2)(A+b cos^(2))(1)/(2)(B+cos^(2))(1)/(2)C)

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

In a triangle ABC,cos A+cos B+cos C

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

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

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