Weierstrass-Riemann function variables 1

$\displaystyle x(t)=\sum_{k=1}^{n} \frac{\cos{(\pi t (k+1)^2)}}{(k+1)^2} \qquad y(t)=\sum_{k=1}^{n} \frac{\sin{(\pi t (k+1)^2)}}{(k+1)^2} $

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