Question

qual o valor de cos (-2π/3)???

Answer 1

$\sf \cos\Bigg( - \frac{2\pi}{3} \Bigg) \\ \\ \\ \\ \sf \cos\Bigg( \frac{2\pi}{3} \Bigg) \\ \\ \\ \\ \sf {\color{red} - \frac{1}{2} }$

Att: Nerd1990