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  beginTableau(105)
newLigneVariables(btex $ {x}$ etex);
   val(btex $-50$ etex);val(btex $\frac{-2}{3}$ etex);
val(btex $\mbox{-}\frac{\sqrt{5}}{5} $ etex);
val(btex $\frac{\sqrt{5}}{5} $ etex);
val(btex $50$ etex); 
newLigneSignes(btex $\hbox{  Signe de }\atop{\displaystyle  {3\cdot \mbox{x}\mbox{+}2}}$ etex);
                              moins;
                                valBarre(btex 0 etex);plus;barre;
                              plus;barre;plus;
                              
newLigneSignes(btex $\hbox{  Signe de }\atop{\displaystyle  {5\cdot \mbox{x}^{2}-1}}$ etex);
                              plus;barre;
                              plus;
                                valBarre(btex 0 etex);moins;valBarre(btex 0 etex);plus;
                              
 newLigneSignes(btex $\hbox{  Signe du }\atop{{\displaystyle \rm   produit}}$ etex);
                              moins;valBarre(btex 0 etex); plus;valBarre(btex 0 etex);moins;valBarre(btex 0 etex);plus;
                              
endTableau;