public ComplexNumber Sum(ComplexNumber a, ComplexNumber b) { return(a + b); }
public ComplexNumber Divide(ComplexNumber a, ComplexNumber b) { return(a / b); }
public ComplexNumber Subtract(ComplexNumber a, ComplexNumber b) { return(a - b); }
public ComplexNumber Multiply(ComplexNumber a, ComplexNumber b) { return(a * b); }