$-17-35-27-14$
$y'''+12y''+36y'=0$
$4\sin\left(\frac{x}{2}\right)\cos\left(\frac{x}{2}\right)$
$90a^2+30ad+25ad^2$
$\lim_{x\to1}\left(\frac{14x^2-20x+6}{x-1}\right)$
$-h^2-4k^2-4hk$
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