$\lim_{x\to-5}\left(\frac{25-x^2}{x+5}\right)$
$\frac{5a^{-2}}{5a^{-3}}$
$6x^2y+10y=0$
$\int\:\frac{x}{\sqrt{x+4}}du$
$\:\frac{-cos^2x}{\left(sen\:x+1\right)}$
$\int\frac{x^3-7x^2+6x-8}{x^4}dx$
$\lim_{x\to\infty}\left(\arccsch\left(\frac{1}{x}\right)\right)$
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