plot_implicit(
    Eq(y, sin(x)) & (y > 0),
    Eq(y, sin(x)) & (y < 0),
    (x, -2 * pi, 2 * pi), (y, -4, 4))
# Expected:
## Plot object containing:
## [0]: Implicit expression: (y > 0) & Eq(y, sin(x)) for x over (-6.283185307179586, 6.283185307179586) and y over (-4.0, 4.0)
## [1]: Implicit expression: (y < 0) & Eq(y, sin(x)) for x over (-6.283185307179586, 6.283185307179586) and y over (-4.0, 4.0)