def get_arcs(self, functions):
    (f1, f2) = functions
    top_line = Line(f1.get_corner((UP + RIGHT)), f2.get_corner((UP + LEFT)))
    bottom_line = Line(f1.get_corner((DOWN + RIGHT)), f2.get_corner((DOWN + LEFT)))
    top_arc = Arc(start_angle=((5 * np.pi) / 6), angle=(((- 2) * np.pi) / 3))
    bottom_arc = top_arc.copy()
    bottom_arc.rotate(np.pi)
    arcs = VGroup(top_arc, bottom_arc)
    arcs.set_width(top_line.get_width())
    for arc in arcs:
        arc.add_tip()
    top_arc.next_to(top_line, UP)
    bottom_arc.next_to(bottom_line, DOWN)
    bottom_arc.set_color(MAROON_B)
    return arcs
def get_arcs(self, functions):
    (f1, f2) = functions
    top_line = Line(f1.get_corner((UP + RIGHT)), f2.get_corner((UP + LEFT)))
    bottom_line = Line(f1.get_corner((DOWN + RIGHT)), f2.get_corner((DOWN + LEFT)))
    top_arc = Arc(start_angle=((5 * np.pi) / 6), angle=(((- 2) * np.pi) / 3))
    bottom_arc = top_arc.copy()
    bottom_arc.rotate(np.pi)
    arcs = VGroup(top_arc, bottom_arc)
    arcs.set_width(top_line.get_width())
    for arc in arcs:
        arc.add_tip()
    top_arc.next_to(top_line, UP)
    bottom_arc.next_to(bottom_line, DOWN)
    bottom_arc.set_color(MAROON_B)
    return arcs