I chose to compare in case of 2 complex functions between their left and right function, and the Operation.
This isn't 100% correct, but it's necessary.
There is 2 options:
Cast to ComplexFunction and the aplly function equlas for left and right and check operations.
Or
Compare the f(x)'s of the 2 ComplexFunctions in specific x's range.
I chose to compare in case of 2 complex functions between their left and right function, and the Operation. This isn't 100% correct, but it's necessary.