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$$$\operatorname{acos}{\left(-1 \right)}$$$
The calculator will find the inverse cosine of $$$-1$$$ in degrees and radians.
Related calculator: Inverse Cosine Calculator
Answer
$$$\operatorname{acos}{\left(-1 \right)} = \pi\approx 3.141592653589793$$$A
$$$\operatorname{acos}{\left(-1 \right)} = 180^{\circ}$$$A
For graph, see the graphing calculator.