Question

3tg63-3tg18/1+tg63*tg18

Answer 1

$\frac{3tg63а-3tg18а}{1+tg63аtg18а}=3\cdot \frac{tg63а-tg18а}{1+tg63аtg18а}=3tg(63а-18а)=3tg45а=3$