Question

In a triagle ABC If a, b, c are in A.P then prove that cosAcotA/2,cosBcotB/2,cosCcotC/2 also in A. P

Answer 1

Answer:

if they are in AP then they should hv a common difference

so,

B(coscot/2)-A(coscot/2)=d

B-A=d

it is given that AB and C are in AP so,

the question is also in AP