$\lim_{x\to0}\left(\frac{\left(n+1\right)^2\left(nln+1\right)^2}{\left(n^2ln^2n\right)}\right)$

$\frac{\left|2x\right|^7-1^1}{2x-1}$

$\frac{3}{4}x^{-2}\:\cdot\frac{16}{6}xy^2$

$\:\sqrt{x}\left(2x-3\right)^4$

$\frac{1}{cos^2x}+\frac{sinx}{cosx}=1$

$\left(m^2+5\right)^2$

$xy=4y$