%pylab inline

x = linspace(-10, 10, 1000)
plot(x, sin(x), '-r')
plot(x, cos(x), '--g')

plot(x, sin(x), '-r', label='sine')
plot(x, cos(x), '--g', label='cosine')
xticks([-10, 0, 10])
yticks([-1, 0, 1])
ylim(-2, 2)
legend()
grid()

x = linspace(0, 2 * pi, 1000)
y = 1 + 2 * cos(5 * x)
subplot(121)
plot(x, y)
subplot(122, polar=True)
polar(x, y)