import matplotlib.pyplot as plt
import numpy as np

start=-2*np.pi
final=+2*np.pi
step = 0.1

x = np.arange(start, final+step, step)
y = np.sin(x)
z = np.cos(x)

plt.xlabel("x")
plt.ylabel("y")
plt.plot(x, y)
plt.plot(x, z)

plt.grid()
plt.show()