#encoding=utf-8

import?numpy?as?np
def?main():

????import?matplotlib.pyplot?as?plt
????x=np.linspace(-np.pi,np.pi,256,endpoint=True)
????c,s=np.cos(x),np.sin(x)
????plt.figure(1)
????plt.plot(x,c)
????plt.plot(x,s)
????plt.show()

if?__name__?==?'__main__':
????main()