

[tex]a) lim\frac{\sqrt{4n^2+1}-2n-1}{\sqrt{n^2+4n+1}-n}[/tex]
[tex]b)lim\frac{n^2+\sqrt[3]{1-n^6}}{\sqrt{n^4+1}-n^2}[/tex]
[tex]c)lim\frac{\sqrt{n^2-4n}-\sqrt{4n^2+1}}{\sqrt{3n^2+1}-n}[/tex]
[tex]b)lim\frac{n^2+\sqrt[3]{1-n^6}}{\sqrt{n^4+1}-n^2}[/tex]
[tex]c)lim\frac{\sqrt{n^2-4n}-\sqrt{4n^2+1}}{\sqrt{3n^2+1}-n}[/tex]