$$$\operatorname{acos}{\left(\frac{2}{3} \right)}$$$

求$$$\operatorname{acos}{\left(\frac{2}{3} \right)}$$$。

$$$\operatorname{acos}{\left(\frac{2}{3} \right)}\approx 0.84106867056793$$$A

$$$\operatorname{acos}{\left(\frac{2}{3} \right)} = \left(\frac{180 \operatorname{acos}{\left(\frac{2}{3} \right)}}{\pi}\right)^{\circ}\approx 48.189685104221402^{\circ}$$$A

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