$\lim_{x\to1}x^2+\sqrt{x+3}$
$\frac{dy}{dx}=-5$
$\frac{dy}{dx}-3y=9$
$6\left(6h\right)$
$1-x'=\frac{x-1}{x-2}$
$\frac{1}{\sin\left(\frac{y}{2}\right)\cdot\cos\left(\frac{y}{2}\right)}$
$2n^2+4n=26$
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