Lovely Heart Curve!

Image Credit: Penguin

Mai Valentine and Joey Wheeler continued to decide what to decorate for the party. Instead of copying the graph above formed by the following parametric equations $\begin{array}{rl} x(t) &= 16\sin^3(t)\\ y(t) &= 13\cos(t) - 5\cos(2t) - 2\cos(3t) - \cos(4t) \end{array}$

they thought that creating the wave related to the heart curve, similar to the following example:

图片来源:维基百科

However, since some of their friends dislikejump discontinuities, they were concerned that

For all real $t$, the wave graph of the parametric equations contains at least a jump discontinuity.

Does there exist a jump discontinuity of the wave graph, or were Joey and Mai imagining?

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This is the end of third chapter of thestory. Check out the following chapters:

First-Second- Third -Fourth-Fifth