$\frac{x^2+6x+9}{x^2+2x-15}$
$\frac{-2x^3+x+14}{x-2}$
$4d^2-22d+121$
$x^2\:-7x\:+\:12$
$4x-9<39$
$\left(z^5+7\right)^2$
$\lim_{x\to0}\left(\frac{\left(x\right)}{\left(\sqrt{1-cos\left(2x\right)}\right)}\right)$
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