$\lim_{x\to\infty}\left(\ln\left(x+1\right)-ln\left(x^2-1\right)\right)$
$10\left(+50\right)$
$ln7x$
$3y+\frac{dy}{dx}x^3=6x^2y$
$4\left(5n+2\right)+10-7n$
$17\sqrt{8}$
$-28-3y^22+y^24$
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