$\frac{x^2+12x+27}{x^2-9}$
$tan\:x\:+\:cot\:x=\:sec\:x\:.\:csc\:x$
$\int x^3b^{2x}dx$
$\frac{r}{14}>-3$
$\frac{dy}{dx}=3x-y$
$16x^2-32x=65$
$\left(2a^2b+3b\right)\left(2a^2b-3b\right)$
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