How does one graph this?

edit

I am trying to parametrize $x^2+y^2+sin(4x)+sin(4y)=4$.

I need to find a way of taking the intersections between $x^2+y^2+\sin(4x)+\sin(4y)=4$, and $\tan(nx)$. As n increases from $0\le{n}\le{2\pi}$, I can take the following in coordinate-form....

$$(n,\text{The x-intersection value})$$ $$(n,\text{The y-intersection value})$$

Finally I need to take the following to graph its parametric derivative. Which is...

$$\frac{({\text{The x-intersection value}})^2+4\cos(4(\text{The x-intersection value}))}{-(\text{The y-intersection value})^2-4\cos(4(\text{The y-intersection}))}$$

I have little knowledge with how to use sage. If someone can help I'll be thankful.