Question

cossec x + sec² 2x + cotg $\frac{3x}{2}$, para x=$\frac{pi}{6}$

Answer 1

$sec = \frac{1}{cos} \\ cossec = \frac{1}{sen} \\ cotg = \frac{1}{tg}$
π/6 = 30º
$cossec(30) + sec^2 (60) + cotg (45) = 2 + 4 + 1 = 7$