eq1 = Eq((cos(x) - sin(y) / 2)**2 + 3 * (-sin(x) + cos(y) / 2)**2, 2)
eq2 = Eq((cos(x) - 2 * sin(y))**2 - (sin(x) + 2 * cos(y))**2, 3)
graphics(
    contour(
        eq1.rewrite(Add), (x, 0, 2 * pi), (y, 0, 2 * pi),
        rendering_kw={"levels": [0]},
        fill=False, clabels=False),
    contour(
        eq2.rewrite(Add), (x, 0, 2 * pi), (y, 0, 2 * pi),
        rendering_kw={"levels": [0]},
        fill=False, clabels=False),
)
# Expected:
## Plot object containing:
## [0]: contour: 3*(-sin(x) + cos(y)/2)**2 + (-sin(y)/2 + cos(x))**2 - 2 for x over (0.0, 6.283185307179586) and y over (0.0, 6.283185307179586)
## [1]: contour: -(sin(x) + 2*cos(y))**2 + (-2*sin(y) + cos(x))**2 - 3 for x over (0.0, 6.283185307179586) and y over (0.0, 6.283185307179586)