Returns the arc-cosine of f - the angle in radians whose cosine is f.

	print (Mathf.Acos(0.5));

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        print(Mathf.Acos(0.5F));
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		print(Mathf.Acos(0.5F))