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plot {y=x, y = x + 2 * -x/(1.0^3 * sqrt(2*pi)) * exp(-x^2 / (2*1.0^2))} from -3 to +3
plot {y=x, y = x + 2 * -x/(1.0^3 * sqrt(2*pi)) * exp(-x^2 / (2*1.0^2))} from -3 to +3
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