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plot 2x^2, e^x-1, x^2 + e^x - 1, 0.5*x^2*(1.6^x - 1) from x=0 to x=5
plot 2x^2, e^x-1, x^2 + e^x - 1, 0.5*x^2*(1.6^x - 1) from x=0 to x=5
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