acos

public static double acos(double x)

The arccosine of the number expressed in radians. The returned value will be between 0 and π (inclusive). The result is NaN if the provided argument is out of range.

Parameters

x

The number to get the arccosine of.

Returns the arccosine (in radians) for a number within the range [-1, 1] (inclusive). If the provided number is out of range, NaN will be returned.

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import System;   Console.log(Math.acos(-2));  // NaN Console.log(Math.acos(-1));  // 3.141592653589793 Console.log(Math.acos(0.5)); // 1.0471975511965979 Console.log(Math.acos(1));   // 0