acos

acos(number argument) → real result

Computes the arccos of argument, within [0, PI].

Computes the arc cosine of argument, in the interval [0, PI].

Parameters

argument: Number whose arc cosine will be computed.

Return

result: The arc cosine of argument.

Examples

acos(0) // PI / 2 acos(0.5) // PI / 3 acos(-0.5) // 2 * PI / 3