$\lim x->3\left(5\right)$

$y=\frac{e^{x^{2}-1}\sqrt{x^{2}+4}}{x\left(x-5\right)}$

$\left(a-1+b\right)\left(a+b+1\right)$

$\left(mn^3\right)\left(m^4n^2\right)$

$5x^2+7x=2$

$\frac{\left(\:2\:x^5\:-\:3\:x^3\:+\:2\:x\:-\:1\right)}{\:-\:x^3\:+\:2\:x^2\:-\:3\:}$

$\left(25c-\frac{1}{5}\:\right)^2$