Function ReferenceACOSOn this pageACOS Returns the arccosine (inverse cosine) of a number, in radians. CategoryTrigSyntaxACOS(number) Parameters ParameterRequiredDescriptionnumberRequiredThe cosine value between -1 and 1. Example ACOS(0.5) // → 1.0472… (π/3 rad) Auto-generated from the EngCanvas function registry.