Question

Qual o valor de Cos (17 pi/3)

Answer 1

Oie, tudo bom?

$= \cos( \frac{17\pi}{3} )$

$= \cos( \frac{5\pi}{3} + 2 \: . \: 2\pi )$

$\boxed{ \cos(t±2 \: . \: k \: . \: \pi) = \cos(t) \: , \: k ∈ℤ}$

$= \cos( \frac{5\pi}{3} )$

$\boxed{ = \frac{1}{2} }$

Att. NLE Top Shotta