(tg2x-tgx):(1+tgxtg2x)=1

Question

(tg2x-tgx):(1+tgxtg2x)=1

Answer 1

(tq2x-tqx)/(1+tq2x*tqx) =1;
tq(2x-x) =1;
tqx=1;
x=π/4 +π*k , k∈Z.