getUsedFreeformFunctions method
Get mentioned custom defined functions that are required to evaluate the expression
Searches the math tree for any MathFunctionFreeform instances and returns a set of their definitions.
Implementation
@override
Set<MathDefinitionFunctionFreeform> getUsedFreeformFunctions() {
return {
...left.getUsedFreeformFunctions(),
...right.getUsedFreeformFunctions()
};
}