Reference FQL API reference Math Math.acos() Math.acos() Get the inverse cosine in radians of a Number. Signature Math.acos(x: Number) => Number Description Gets the inverse cosine in radians of a Number. Parameters Parameter Type Required Description x Number true A number. Return value Type Description Number Inverse cosine in radians of the provided number. Examples Math.acos(0.5) 1.0471975511965979 Math.abs() Math.asin()