How to plot multiple functions on the same figure, in Matplotlib?

How can I plot the following 3 functions (i.e. sin, cos and the addition), on the domain t, in the same figure?

    from numpy import *
    import math
    import matplotlib.pyplot as plt

    t = linspace(0, 2*math.pi, 400)

    a = sin(t)
    b = cos(t)
    c = a + b

To plot multiple graphs on the same figure you will have to do:

    from numpy import *
    import math
    import matplotlib.pyplot as plt

    t = linspace(0, 2*math.pi, 400)
    a = sin(t)
    b = cos(t)
    c = a + b

    plt.plot(t, a, 'r') # plotting t, a separately 
    plt.plot(t, b, 'b') # plotting t, b separately 
    plt.plot(t, c, 'g') # plotting t, c separately 
    plt.show()

enter image description here

From: stackoverflow.com/q/22276066