graphics(
    line(sin(x), (x, 0, pi), label="a", n=20, scatter=True),
    line(cos(x), (x, -pi, pi), label="b", rendering_kw={"linestyle": "--"}))
# Expected:
## Plot object containing:
## [0]: cartesian line: sin(x) for x over (0.0, 3.141592653589793)
## [1]: cartesian line: cos(x) for x over (-3.141592653589793, 3.141592653589793)