In a `Delta ABC`, If `tan\ A/2, tan\ B/2, tan\ C/2` are in A.P. then `cos A, cos B, cos C` are in

. In a DeltaABC, If tan (A/2) , tan(B/2), tan (C/2) , are in H.P.,then a,b,c are in

In a Delta ABC tan ""A/2, tan ""B/2, tan ""C/2 are in H.P., then the vlaue iof cot ""A/2 cot ""C/2 is :

In Delta ABC if tan(A/2) tan(B/2) + tan(B/2) tan(C/2) = 2/3 then a+c

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

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

In a triangle ABC, if sin A sin(B-C)=sinC sin(A-B) , then prove that cos 2A,cos2B and cos 2C are in AP.

In a /_\ABC, tan\ A/2 = 5/6 and tan\ C/2 = 2/5 then (A) a,c,b are in A.P. (B) a,b,c are in A.P. (C) b,a,c are in A.P. (D) a,b,c are in G.P.

In any Delta ABC the value of 1-tan""B/2 tan""C/2 is equal to :-

If tan "" (x-y)/( 2 ), tan z, tan "" (x + y)/( 2) are in G.P. then show that cos x = cos y. cos 2z

If in Delta ABC, tan.(A)/(2) = (5)/(6) and tan.( C)/(2)= (2)/(5) , then prove that a, b, and c are in A.P.