also, atanx +bsecx=c,i missed c and i am sorry for that
The more I study your question, it is fraught with errors.
Are you certain you are not proving
Tan(P+Q)= 2ac/(a^2-c^2)
That is rather straightforward.
yeah one more mistake from my part it is to prove tan(p+q)=...
atanx bsecx
This is another answer -
We are going to elinamate 'b' (rember in this type of questions ordirnely elimanation is important) i gave a ans in pervious post now other.
P and q are roots therfore..
atanp bsecq