In a triangle, if the angles `A , B ,a n dC` are in A.P. show that `2cos1/2(A-C)=(a+c)/(sqrt(a^2-a c+c^2))`

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

If a, b, c are in A.P. then show that 2b = a + c.

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

In in a triangle ABC , sides a,b,c are in A.P. then tan""A/2 tan""C/2

If in a Delta ABC,sin A,sin B,sin C are in A.P. show that 3tan,(A)/(2)tan,(C)/(2)=1

In a Delta ABC ,if angle, A,B,C are in A.P then (a+c)/(sqrt(a^(2)-ac+c^(2) 1.cos((A-C)/(2)) 2. 2cos((A-C)/(2)) 3. 2sin((A-C) 4. 2cos(A+C)