code: public static ComplexNumber Divide(ComplexNumber z1, double scalar) {
          return new ComplexNumber(z1.real / scalar, z1.imaginary / scalar);
      }
docs: Divides scalar value to a complex number.
  
  @param z1     Complex Number.
  @param scalar Scalar value.
  @return Returns new ComplexNumber instance containing the divide of specified complex number with the scalar value.