S = 2 * sin (x) - sin (2 * x) + 2 / 3 * sin (3 * x) - 1 / 2 * sin (4 * x) + 2 / 5 * sin (5 * x)
x=0:0.1:2*pi;
s=2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x);
plot(x,s)
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