ArcCos

ArcCos[z] gives the arc cosine (inverse cosine) of z, returning a value in the range $0$ to $\pi$.

Examples

Compute the arc cosine of common values:

ArcCos[1/2]
(* Pi/3 *)

ArcCos[0]
(* Pi/2 *)

N[ArcCos[0.5]]
(* 1.0472 *)

Please visit the official Wolfram Language Reference for more details.