$\lim_{x\to0}\left(5secx-5tanx\right)$
$\left(-6x-9\right)\left(6x+9\right)$
$\left|3-\left(-2\right)\right|$
$\left(m^8-17\right)\left(m^8-4\right)$
$\frac{dy}{dx}=2x^2-x$
$\left(3m-11n\right)\left(3m-11n\right)$
$\lim_{y\to0}\left(\frac{2\left(x+y\right)^2-5\left(x+y\right)-2x^2-5x}{y}\right)$
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