$30a^2-42a$
$\int6\sec^2\left(x-9\right)dx$
$x^2-16x+16=0$
$1096\:+\:-15414$
$\lim_{x\to6}\frac{x^2-13x+42}{x-6}$
$\frac{12x^5}{4x^7}$
$\frac{du}{dx}=2-u$
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