$$$\operatorname{acos}{\left(- \frac{1}{3} \right)}$$$

$$$\operatorname{acos}{\left(- \frac{1}{3} \right)}$$$을(를) 구하시오.

$$$\operatorname{acos}{\left(- \frac{1}{3} \right)}\approx 1.910633236249019$$$A

$$$\operatorname{acos}{\left(- \frac{1}{3} \right)} = \left(\frac{180 \operatorname{acos}{\left(- \frac{1}{3} \right)}}{\pi}\right)^{\circ}\approx 109.471220634490691^{\circ}$$$A

그래프는 graphing calculator를 참고하세요.