$\frac{x+2}{x^2+7x+12}$
$\frac{dy}{dx}=x^2\sin\left(2x\right)$
$-2x+8=18$
$2 h + 4 h - 7$
$\frac{1-\tan^4\left(x\right)}{\left(1-\tan^2\left(x\right)\right)\csc^2\left(x\right)}$
$\lim_{x\to9}\left(\frac{4x-36}{\sqrt{x-9}}\right)$
$-6m^2+4mn$
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