1) Lim(4x+1)/sqrt(4x²+1) = lim(4x+1)/(2x*sqrt(1+1/(4x²)) =lim(4+1/x)/(2*sqrt(1+1/(4x²)) =
=4/2=2 ;
2) Limx²/(sqrt(x² +1) -1) [ неопределенность типа 0/0]
= Limx²*sqrt(x² +1)+1)/(sqrt(x²+1)-1)*sqrt(x²+1)+1)=
= Lim x²*sqrt(x²+1)+1)/x² =Limsqrt(x² +1) =1.