$\lim_{x\to-3}\left(\frac{\left(x^2+6x+9\right)}{-15-2x+x^2}\right)$
$\frac{x^2-4x-45}{x-81}$
$\frac{dy}{dx}=\frac{5x}{y+x^2y}$
$\left(4+2n\right)^2$
$16x^2-80x+100$
$y\cdot\tan x\frac{dy}{dx}=\left(y^2+4\right)\cdot\sec^2x$
$+\left(-4.1\right)\left(+1\right)$
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