Complex Math Q:z.pow(2) != z*z

I've done a Complex Number class and I get some errors.
If I try to multiply a complex number by itself it doesn't equals when I use my pow function.
z*z != z.Pow(2);

[code]
public ComplexNumber Pow(double n)
{
double ra = Math.Pow(modulus, n),
th = argument * n;
return new ComplexNumber(ra * Math.Cos(th),
ra * Math.Sin(th));
}
public static ComplexNumber operator *(ComplexNumber a,
ComplexNumber b)
{
double r = a.r * b.r - a.i * b.i;
double i = a.r * b.i + a.i * b.r;
return new ComplexNumber(r, i);
}
[/code]
[hr]
El PROgrammador Niklas Ulvinge
(who doesn't know how to spell in inglish)
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