$\lim_{x\to2}\left(\frac{4x^2-64}{x-4}\right)$

$\int\frac{x^2+5x+1}{\left(x-4\right)^2}dx$

$y'=\frac{xy}{y^2-1}$

$\left(x+\frac{7}{4}\right)^2$

$\sin^2x\cot\left(x\right)$

$\left(\sqrt{3}x-\sqrt{3}y\right)\left(\sqrt{3}x+\sqrt{3}y\right)$

$\left(4^{3n}-4^{-3n}\right)^2$