WOLFRAM SYSTEM MODELER
    'asin()'asin()  | 
     | 
SystemModel["ModelicaReference.Operators.'asin()'"]
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This information is part of the Modelica Standard Library maintained by the Modelica Association.
Trigonometric inverse sine function
asin(u)
Returns the inverse of sin of u, with -1 ≤ u ≤ +1. Argument u needs to be an Integer or Real expression.
The asin function can also be accessed as Modelica.Math.asin.
asin(0) = 0.0