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RationalDegree.svg en Rational function of degree defined by frac left right for direction in top bottom left right ax axisdirection setvisible False ax axis yzero setaxisdirection left ax grid False ax minortickson ax plot 'b' ax plot 'b' ax plot 'b' ax arrow color 'k' lw ls 'dashed' ax arrow sqrt ylim ylim color 'k' lw