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#Fonction puissance
X¨(n/p)=p¸†(X¨n)
X¼=¥(gln X)

#fct exp base a
~a¨x=¥(xln a)
~[a(x)]'=(ln a)©a^x

#fct log arithme base a
~log (a)x=(ln x)/ln a
~[log (a)x]'=1/(x©ln a)