public static Complex[] multiPoly(Complex[] t, Complex[] p, int N)
    {
        Complex[] tempt = new Complex[2*N];
        Complex[] tempp = new Complex[2*N];
        for(int i=0; i<2*N; i++)
        {
            if(i<N)
            {
                tempt[i]=t[i];
                tempp[i]=p[i];
            }
            else
            {
                tempt[i]=new Complex(0, 0);
                tempp[i]=new Complex(0, 0);
            }
        }
        Complex[] transformedt = FFT(tempt, 2*N);
        Complex[] transformedp = FFT(tempp, 2*N);
        Complex[] timeser = new Complex[2*N];
        for(int i= 0; i<timeser.length; i++) timeser[i] = transformedt[i].times(transformedp[i]);
        Complex[] inversed = iFFT(timeser, 2*N);
        return inversed;
    }