If `a^2,b^2,c^2` are in A.P., prove that `cotA ,cotB ,cotC` are in `AdotPdot`

If a^2, b^2,c^2 are in A.P., then prove that tanA ,tanB ,tanC are in H.P.

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 a^2,b^2,c^2 are in A.P. prove that 1/(b+c),1/(c+a),1/(a+b) are in A.P.

If a^2,b^2,c^2 are in A.P., then prove that the following are also in A.P. Prove 1/(b+c),1/(c+a),1/(a+b)

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

IN any DeltaABC prove that if a^(2),b^(2) and c^(2) are in AP, the cotA, cotB and cotC are also is AP.

In a triangle ABC, if sinAsin(B-C)=sinCsin(A-B), then prove that cotA ,cotB ,cotC are in AdotPdot

In a /_\A B C , if tanA/2,tanB/2,tanC/2"are in"AdotPdot, then show that cosA ,cosB ,cosC are in AdotPdot

In a triangle ABC, if sinAsin(B-C)=sinCsin(A-B), then prove that cotA ,cotB ,cotCa r einAdotPdot

If 1/a ,1/b ,1/c are in A.P. prove that: (b+c)/a ,(c+a)/b ,(a+b)/c are in A.P.