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plot cos(x),-cos(x+(2*pi)/3),cos(x+(4*pi)/3),-cos(x)+cos(x+(2*pi)/3)-cos(x+(4*pi)/3)
plot cos(x),-cos(x+(2*pi)/3),cos(x+(4*pi)/3),-cos(x)+cos(x+(2*pi)/3)-cos(x+(4*pi)/3)
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