$\lim_{x\to3}\left(\frac{3-x}{9-3x^2}\right)$
$\lim_{x\to\infty}\left(\sqrt{x^2+100x}-\sqrt{x^2+50x}\right)$
$p-1=-12$
$\tan\left(290\right)=\frac{\sin\left(290\right)}{\cos\left(290\right)}$
$-90+612$
$6x\:=30$
$\frac{28x^5}{14x^{-4}}$
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