public static ComplexNumber Subtract(ComplexNumber z1, ComplexNumber z2) {
        return new ComplexNumber(z1.real - z2.real, z1.imaginary - z2.imaginary);
    }
public static ComplexNumber Subtract ( ComplexNumber z1 , ComplexNumber z2 ) { return new ComplexNumber ( z1 . real - z2 . real , z1 . imaginary - z2 . imaginary ) ; }
Subtract two complex numbers.

@param z1 Complex Number.
@param z2 Complex Number.
@return Returns new ComplexNumber instance containing the subtract of specified complex numbers.