from sympy import *
from spb import *
x, a = symbols("x a")
plot_parametric(
    cos(a * x), sin(x), (x, 0, 2*pi),
    params={a: (0.5, 0, 2)},
    aspect="equal", use_latex=False,
    xlim=(-1.25, 1.25), ylim=(-1.25, 1.25)
)