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$$$\operatorname{acos}{\left(- \frac{1}{2} \right)}$$$
The calculator will find the inverse cosine of $$$- \frac{1}{2}$$$ in degrees and radians.
Related calculator: Inverse Cosine Calculator
Answer
$$$\operatorname{acos}{\left(- \frac{1}{2} \right)} = \frac{2 \pi}{3}\approx 2.094395102393195$$$A
$$$\operatorname{acos}{\left(- \frac{1}{2} \right)} = 120^{\circ}$$$A
For graph, see the graphing calculator.