$3u^2-u-14$
$\lim_{x\to4}\left(\frac{x^2-6-\sqrt{x+6}}{\sqrt{x+1}-2}\right)$
$730x^2-690x$
$\frac{dy}{dx}=\frac{x^2-8}{4y^2}$
$\left(8x^5y^5-9x^4y^6\right)^2$
$\left(-4x^2+1\right)^{-\frac{1}{2}}$
$a+6\cdot a+8$
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