i want to plot a square wave

this is the main equation f(t)=(4/m*pi)sin(2*pi*m*t) m=1,3,5,7,9
and I need to plot the sum of harmonics against time for a time period between 0 and 10
f(t)=(4/pi)sin(2*pi*t)+(4/3*pi)sin(2*pi*3*t)+(4/5*pi)sin(2*pi*5*t)+(4/7*Pi)sin(2*pi*7*t)

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2015-10-18

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