$\lim_{x\to0}\left(\frac{\sqrt{x+3}\:-2}{x-1}\right)$

$\log\left(4\right)xy^6z^4$

$\left(4x-6y+8a\right)-\left(6a-9z+12j\right)$

$p^{5}q^{4}+\frac{10}{3}p^{4}q^{5}+\frac{25}{6}p^{3}q$

$\left(2.6\right).\left(4.9\right)$

$\lim_{n\to\infty}\left(sin\:n\right)$

$e\frac{3}{\infty}-1$