y=x/1.5+(1/x)(1000-(x/1.5)^2*.75-x^2/2+x^2/4)+x/2 from 0 to 80y=x/1.5+(1/x)(1000-(x/1.5)^2*.75-x^2/2+x^2/4)+x/2 from 0 to 80

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