$\frac{6-x^2}{2-x}$
$2,23-3$
$\frac{d}{dx}\left(2\sin\left(tan\left(x^2+4\right)\right)\right)$
$y=2\sqrt{x}-\sqrt{x^2}$
$\frac{2x}{3x^2-5x-2}$
$9n+4=-32$
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