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d>0ãxä=(™b™†d)/2a
   ãxå=(™b‰†d)/2a
   ãf(x)=a(x™xä)(x™xå)
   ãsgn de ™a entre les racines
d=0ãx=™b/2a
   ãsgn de a
Sommet:a(x‰b/2a)‹™(b‹™4ac)/4a
xä‰xå=™b/a
xäxå=c/a
{xä‰xå=S
{xäxå=P
 ãx‹™Sx‰P=0

Cercle:(x™a)‹‰(y™b)‹=R‹

a^3™b^3=(a™b)(a‹‰ab‰b‹)
a¼™b¼=(a™b)(a¼›‰ba¼~‹‰b‹a¼~^3‰.‰a‹b¼~^3‰ab¼~‹‰b¼›)
a¼‰b¼=(a‰b)(a¼›™ba¼~‹‰b‹a¼~^3™.‰a‹b¼~^3™ab¼~‹‰b¼›)
(a‰b)^3=a^3‰3ba‹‰3ab‹‰b^3

(Z‰Z')¨n=n˜0©Z¨0©Z'¨n‰n˜1©Z¨1©Z'¨(n™1)