Inverse Cosine Calculator

Calculate the inverse cosine of a number

The calculator will find the inverse cosine of the given value in radians and degrees.

The inverse cosine $y=\cos^{-1}(x)$ or $y=\operatorname{acos}(x)$ or $y=\operatorname{arccos}(x)$ is such a function that $\cos(y)=x$ .

The domain of the inverse cosine is $[-1,1]$ , the range is $[0,\pi]$ .

It is an even function.

Related calculator: Cosine Calculator

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

$\operatorname{acos}{\left(\frac{1}{2} \right)} = \frac{\pi}{3}\approx 1.047197551196598$ A

$\operatorname{acos}{\left(\frac{1}{2} \right)} = 60^{\circ}$ A

For graph, see the graphing calculator.