In a `DeltaABC` the angles A, B, C are in A.P. show that `2cos""(A-C)/2=(a+c)/sqrt((a^(2)-ac+c^(2)))`

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))

If three angles A, B, and C are in A.P. prove that: cot B=(sin A-sin C)/(cos C-cos A)

In DeltaABC , a,b,c are in A.P., prove that: cotA/2.cotC/2=3

If in a DeltaABC, sin A, sin B, sin C are in A.P., show that 3 tan, A/2 tan, C/2 = 1

If the angles A, B, C of DeltaABC are in A.P. and b:c=sqrt(3):sqrt(2) , show that A=75^(@) .

If a, b, c are in A.P., prove that a^(3)+4b^(3)+c^(3)=3b(a^(2)+c^(2)).

In DeltaABC , if a,b,c are in A.P. prove that: cot(A/2),cot(B/2), cot(C/2) are also in A.P.

If the sides a,b,c are in A.P., prove that (tan)A/2+ (tan) c/2=2/3( cot) B/2.

If one of the angles A,B,C of a triangle is not acute, show that cos^2A+cos^2B+cos^2C=1

In DeltaABC , 1/a,1/b,1/c are in A.P. prove that "cosec"^(2)A/2, "cosec"^(2)B/2, "cosec"C/2 are also in A.P.