$\displaystyle x(t)=\sum_{k=1}^{n} \frac{\cos{(\pi (k+m)^l t)}}{(k+m)^l} \qquad y(t)=\sum_{k=1}^{n} \frac{\sin{(\pi (k+m)^l t )}}{(k+m)^l}\times(1-2key)^k \quad (key=0,1) $

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