0<sin1/(x-1)<1=>0<sin1/(x-1)*lnx,<lnx
0<limsin1/(x-1)<limlnx=0
=>limsin1/(x-1)=0 conf regulii clestelui
c)lim(2^x-1)/(2^x+1)
Se da factor comun fortat la bumarator si numitor
lim2^x*(1-1/2^x)/2^x(1+1/2^x)=simplifici prin 2^x
lim(1-1/2^x)/(1+1/2^x)=1 pt ca 2^x→0
d)lim
(x+arcsin1/x=limx+limarcsin1/(x)=+∞=arcsin1/∞=+∞+0=+∞
