FI: -inf+inf 0/+-inf 0/0 +inf/+-inf croissance comparées lim e**x/x**n =+inf x=>+inf lim x**n * e**x =0 x=>-inf lim xln(x)=0- x=>0+ lim ln(x)/x =0 x=>+inf limite: lim ex=0+ x=>-inf lim ex=1 x=>0 lim ex=+inf x=>+inf lim ln(x)=-inf x=>0 lim ln(x)=+inf x=>+inf