$\lim_{x\to3}\left(\frac{x^3+27}{x^2+9}\right)$
$\int\frac{x^3+23}{x^2+7x+12}dx$
$\frac{1+\sec\left(t\right)}{1-\sec\left(t\right)}$
$5a^2+8ab$
$\int\left(b-3\right)\left(b+3\right)dx$
$\left(8x+16\right)^2$
$\lim_{x\to0}\left(5^x+x\right)^{\frac{1}{x}}$
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