plot(600-x^3,axes_labels=['$x$','$y$'])
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plot(-2*x^2+1,-.71,-.7,axes_labels=['$x$','$y$'])
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plot(cos(x),0,12,color='red',axes_labels=['$x$','$y$'])+plot(cos(2*x),0,12)+plot(2*cos(2*x),0,12,color='green')
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