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plot (sin(2*pi*2500*t) + sin(2*pi*3*2500*t) + sin(2*pi*9*2500*t)), t from 0 to 4e-4
plot (sin(2*pi*2500*t) + sin(2*pi*3*2500*t) + sin(2*pi*9*2500*t)), t from 0 to 4e-4
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