[" If "a,b,c" are in "A.P.," then "],[cos((A-C)/(2))cosec((B)/(2))=]

If angles A,B,C are in A.P . , then 2cos (( A-C)/( 2))=

If a,b and c be in A.P. prove that cos A cot((A)/(2)),cos B cot((B)/(2)), and cos C cot((C)/(2)) are in A.P.

If in a Delta ABC, a, b, c are in A.P . Then cos ((A- C)/( 2)) is equal to

If the side lengths a,b and c are in A.P. then prove that cos ((A-C)/2) = 2sin (B/2)

If a^(2), b^(2), c^(2) are in A.P., then : (cos A)/a, (cos B)/b, (cos C)/c are in

If A,B,C are in A.P then (sin A-sin C)/(cos C-cos A)=

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.

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.