human
Complete this python program:
def find_r_to_boundary_of_closedpath(inside_closedpath, xy, cos_t, sin_t, rmin=0.0, rmax=1.0, tolerence=0.01):
assistant
#Here is the Python code you requested.

    """Find a radius r (centered at *xy*) between *rmin* and *rmax* at
    which it intersect with the path.
    inside_closedpath : function
    cx, cy : center
    cos_t, sin_t : cosine and sine for the angle
    rmin, rmax :
    """
    (cx, cy) = xy
    def _f(r):
        return (((cos_t * r) + cx), ((sin_t * r) + cy))
    find_bezier_t_intersecting_with_closedpath(_f, inside_closedpath, t0=rmin, t1=rmax, tolerence=tolerence)