Question

Use os valores notáveis do seno,cosseno e tangente e calcule:
a)cos -135°
b)cotg 7π/6
c)sec 3π/4
d)cossec 5π/3
e)cotg 840°
f)sen 3π
g)sec 1410°
>ME AJUDEM POR FAVOR, PRA AGORA...

Answer 1

a) cos (-135°)= $\frac{ -\sqrt{2} }{2}$
b) cotg (7π/6)= $\sqrt{3}$
c) sec (3π/4)= $- \sqrt{2}$
d) cossec (5π3)= $\frac{-2 \sqrt{3} }{3}$
e) cotg 840°= $\frac{- \sqrt{3} }{3}$
f) sen 3π = 0
g)sec 1410° = $\frac{2 \sqrt{3} }{3}$