3tg63-3tg18/1+tg63tg18 ???

Question

3tg63-3tg18/1+tg63tg18 ???

Answer 1

Tg(x-y)=(tgx-ty)/(1+tgxtgy)
3tg63-3tg18/1+tg63tg18=3(tg63-tg18/1+tg63tg18)=3 tg(63-18)=3tg45=3