$$$\operatorname{acos}{\left(- \frac{1}{2} \right)}$$$

Find $$$\operatorname{acos}{\left(- \frac{1}{2} \right)}$$$.

$$$\operatorname{acos}{\left(- \frac{1}{2} \right)} = \frac{2 \pi}{3}\approx 2.094395102393195$$$A

$$$\operatorname{acos}{\left(- \frac{1}{2} \right)} = 120^{\circ}$$$A

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