12. IF 1/SinA+1/CosA=1/SinB+1/CosB ,PROVE THAT: Cot{(A+B)/2}=TanA.TanB

Answer 1

Hmmm. If 1/SinA+1/CosA=1/SinB+1/CosB it would seem that A=B
I suspect a typo.

Answer 2

Solve

Answer 3

not found