" 28.In "Delta ABC" if "A+C=2B" ,prove that "2cos(A-C)/(2)=(a+c)/(sqrt(a^(2)-ac+c^(2)))

In a Delta ABC prove that cos((A+B)/(2))])=(sin C)/(2)

In triangle ABC if the angles A,B and C be in A.P. then show that 2cos ((A-C)/2)=(a+c)/sqrt(a^2-ac+c^2)

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

In a triangle,if the angles A,B, and C are in A.P.show that 2cos(1)/(2)(A-C)=(a+c)/(sqrt(a^(2)-ac+c^(2)))

In triangle ABC, if A+C=2B , then (a+c)/(sqrt(a^(2)-ac+c^(2))) is equal to

In triangle ABC, if A+C=2B , then (a+c)/(sqrt(a^(2)-ac+c^(2))) is equal to

In Delta ABC if the angle A,B,C are in A.P.then (a+c)/(sqrt(a^(2)-ac+c^(2)))=

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 :(b+c)cos((B+C)/(2))=a cos((B-C)/(2))])

In Delta ABC , if A,B , C are in A.P. The (a+c)/( sqrt(a^(2) -ac + c^(2))