Question

Cos 2pi/3 - a tag de 7pi/6 ​

Answer 1

$\cos(\frac{2\pi}{3}=-\cos(\frac{\pi}{3})=-\frac{1}{2}$

$\tan(\frac{7\pi}{6})=\tan(\frac{\pi}{6})=\frac{\sqrt{3}}{3}$

$\cos(\frac{2\pi}{3}) -\tan(\frac{7\pi}{6}) \\ -\frac{1}{2}-\frac{\sqrt{3}}{3}$