### Find all roots of an equation

Hello,

I have tried the following: used solve() by itself and with "to_solve_poly=True", imported simpy, tried find_root, and tried eq.roots(). find_root() gave me one root when there are several between 0,11.

How can I solve for all the roots in a range. Here is my final code.

```
var('PI')
PI = 2*asin(1.0)
eq = exp(-x)-sin(0.5*PI*x)==0
show(plot(exp(-x)-sin(0.5*PI*x), x, xmin = -10, xmax = 10, ymin =-10, ymax=10))
eq.find_root(0, 11)
```