### how to calculate distance between origin and furthest point on graph?

Hello!
I am new on this forum so forgive me if I don't respect all "rules" or if someone answered already this question.

If you take a look at the image, I just want to know how to calculate the distance between origin and the furthest dot on the graph.

~~code:
~~code:

```
var('t')
ff = (exp(cos(t)) -
```~~2~~*cos(4*t) 2*cos(4*t) + sin(t/12)^5)
~~parametric_plot((ff~~*cos(t),ff*sin(t)), parametric_plot((ff*cos(t),ff*sin(t)), (t,0,2*pi) , fill=True, fillcolor='orange', ~~figsize=[3,3])~~figsize=[3,3])