$\lim_{x\to\infty}\left(\frac{nln\left(n\right)}{x^2+5}\right)$

$a^2+10ab+25^2$

$3\cdot\left(5-9+2\right)-8.\left(3-6-2\right)+4\cdot\left(5-12\right)$

$4x^2+36xy$

$\sqrt[xy]{a^{xz}}$

$2+\frac{1}{\tan\left(y\right)^2}+\tan\left(y\right)^2=\csc\left(y\right)^2\sec\left(y\right)^2$

$\lim_{h\to0}\left(\frac{tan3\left(x-h\right)-tan3\left(x\right)}{h}\right)$