Question

determine y= tg 3π/9.tg 3π/4 .tg π 
                  tg 4π/6 . tg 7π/4

Answer 1

Olá, Lucca.

$y= tg\,\frac{3\pi}9\cdot tg\,\frac{3\pi}4\cdot \underbrace{tg\,\pi}_{=0}\cdot\,tg\,\frac{4\pi}6\cdot tg\,\frac{7\pi}4\Rightarrow\\\\\\ \boxed{y=0}$