$\lim_{x\to\infty}\left(\frac{3-x^2}{3+x^2}\right)$
$n^2-3n+28=0$
$-7\:+\:9\:\cdot\:-3\:+\:15$
$a.b;\:a=-1;\:b=2$
$\sqrt{14}\left(.\right)\sqrt{668}$
$\frac{2}{3}y^3+\frac{2}{3}y^3$
$\lim_{x\to0}\left(\frac{-5x-15}{x^2+3x}\right)$
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