expr = 4 * (cos(x) - sin(y) / 5)**2 + 4 * (-cos(x) / 5 + sin(y))**2
plot_implicit(expr <= pi, (x, -pi, pi), (y, -pi, pi),
    grid=False, color="gold", border_color="k",
    rendering_kw={"linestyles": "-.", "linewidths": 1})
# Expected:
## Plot object containing:
## [0]: Implicit expression: 4*(-sin(y)/5 + cos(x))**2 + 4*(sin(y) - cos(x)/5)**2 <= pi for x over (-pi, pi) and y over (-pi, pi)
## [1]: Implicit expression: Eq(-4*(-sin(y)/5 + cos(x))**2 - 4*(sin(y) - cos(x)/5)**2 + pi, 0) for x over (-pi, pi) and y over (-pi, pi)