Question

Resolução da seguinte questão:
$- \frac{1}{3} - (-\frac{1}{3}cos(- \pi ))$

Answer 1

$-\dfrac{1}{3}-\left(-\dfrac{1}{3}\cos(-\pi) \right )\\ \\ \\ =-\dfrac{1}{3}-\left(-\dfrac{1}{3}\cos(\pi) \right )\\ \\ \\ =-\dfrac{1}{3}-\left(-\dfrac{1}{3}\cdot (-1) \right )\\ \\ \\ =-\dfrac{1}{3}-\left(\dfrac{1}{3}\right )\\ \\ \\ =-\dfrac{2}{3}$