$\int\frac{x}{x^4-16}dx$
$18x^2-12x-5$
$y''+25y=0$
$\lim_{x\to-3}\left(\frac{\left(2x+6\right)\left(x+3\right)}{\left(x-2\right)\left(x+3\right)}\right)$
$-x^2-4x-1$
$\frac{\left(2a^5\right)}{\left(b^7\right)}^2$
$\int\frac{21}{\sqrt{x^2+9}}dx$
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