Reference FQL API reference Math Math.asin() Math.asin() Get the inverse sine in radians of a Number. Signature Math.asin(x: Number) => Number Description Return the inverse sine in radians of a Number. Parameters Parameter Type Required Description x Number true A number. Return value Type Description Number Inverse sine in radians of the provided number. Examples Math.asin(0.5) 0.5235987755982989 Math.acos() Math.atan()