Numpy - zadanie 3

import numpy
import matplotlib.pyplot as plt
from pylab import *
plt.style.use("classic")

x = numpy.arange(-0.5, 0.5, 0.05)
y1 = x
y2 = []
y3 = []

for i in x:
    y2.append(numpy.sin(i))

for i in x:
    y3.append(numpy.tan(i))

fig, ax = plt.subplots()

ax.plot(x,y1, "-b", label="y=x")
ax.plot(x,y2, "-g", label="y=sin(x)")
ax.plot(x,y3, "-r", label="y=tan(x)")
ax.axis("equal")
leg = ax.legend()
plt.show()
plt.savefig("wykres.pdf")