from sympy import *
x = Symbol('x')
from sympy.plotting import *
plot_backends
{'ipythonD3': sympy.plotting.plot.IPythonD3Backend, 'matplotlib': sympy.plotting.plot.MatplotlibBackend, 'text': sympy.plotting.plot.TextBackend}
plot_backends['default'] = plot_backends['ipythonD3']
plot_backends
{'default': sympy.plotting.plot.IPythonD3Backend, 'ipythonD3': sympy.plotting.plot.IPythonD3Backend, 'matplotlib': sympy.plotting.plot.MatplotlibBackend, 'text': sympy.plotting.plot.TextBackend}
plot_parametric((sin(x)*x, cos(x)*x),
(sin(x)*x, -cos(x)*x),
(-sin(x)*x, -cos(x)*x),
(-sin(x)*x, cos(x)*x),
(sin(x)*x, cos(x)*x)[::-1],
(sin(x)*x, -cos(x)*x)[::-1],
(-sin(x)*x, -cos(x)*x)[::-1],
(-sin(x)*x, cos(x)*x)[::-1],
(x,0,2*pi));
plot(sqrt(abs(x)), -sqrt(abs(x)),
sin(x), -sin(x),
cos(x), -cos(x),
sin(x)/x, -sin(x)/x,
tanh(x), -tanh(x),
(x,-2*pi,+2*pi));