from __future__ import division
from scipy import *
import pylab

x = linspace(-1,1,200)

f = x**2
g = -x

pylab.plot(x, f, 'r--', label='f(x)')
pylab.plot(x, g, label='g(x)')
pylab.text(0.41, 0.11, 'f(x)')
pylab.legend()

pylab.show()