-7 2 setxrange
-2.5 6.5 setyrange
traceaxes
axesarrow
marks
/f {setxvar
1
3 x mul Exp 2 mul add
x Exp 4 mul sub
} def
/g {pop 1} def
2 settailletangente
/f' {pop 0} def
2 3 div ln 2 div tracetangente
/f' {pop 2} def
0 tracetangente
mixte
{g} courbe
continu
medium setlinewidth
{f} courbe
setSymbol
(D) Xmin 1 urtext
setTimesItalic
(C) .8 4 text
(f) indice
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