$\lim_{n\to\infty}\left(\frac{2^n}{1+n}\right)$
$2x^2-3x-1\:para\:x=-1$
$\int\left(-5xe^{\left(-7x^2-3\right)}\right)dx$
$\int\frac{1}{\left(x+2\right)\left(x+8\right)}dx$
$\int\frac{7t^4-3t^3+5}{5t^2}dt$
$\frac{a^2-3a-6}{a+3}$
$6z-11\ge7$
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