Question

Qual o valor de Cos (144pi)?

Answer 1

Oie, tudo bom?

$= \cos(144\pi)$

$= \cos(0 + 2 \: . \: 72\pi)$

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

$= \cos(0)$

$\boxed{ = 1}$

Att. NLE Top Shotta