import numpy as np
plot(tan(x), (x, -1.5*pi, 1.5*pi), adaptive_goal=0.001,
     detect_poles=True, tx=np.rad2deg, ylim=(-7, 7),
     xlabel="x [deg]")
# Expected:
## Plot object containing:
## [0]: cartesian line: tan(x) for x over (-10.0, 10.0)