$\lim_{x\to3}\left(\frac{x^2-x-6}{x-3}\right)$
$28^2-14xy^2$
$-90-125$
$\lim_{x\to10}\left(\frac{4x^2-16x+20}{x-10}\right)$
$\left(4-\left(-9\right)\right)\cdot\left(-3\right)$
$csc2\left(x\right)=\frac{sec\left(x\right)csc\left(x\right)}{2}$
$x^3+6x^2+9x+4$
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