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from pylab import *

t = linspace(0, 1, 500)  # array of time, the independent variable

f = 100
y1 = sin(2*pi*f*t)       # 100 Hz sine wave

f = 104
y2 = sin(2*pi*f*t)       # 104 Hz sine wave

plot(t, y1 + y2)
show()