$\lim_{x\to2}\left(\frac{4-x^2}{x-\sqrt{x^2+5}}\right)$
$\left(3x^{3n}-3y^{3n}\right)$
$\sqrt{12}+4senx=0$
$-\left(10-40\right)+\left(-90\right)$
$\lim_{x\to\infty}\frac{sin\left(x\right)}{9-x^2}$
$\lim_{x\to0}\left(\frac{8^t-5^t}{t}\right)$
$\frac{d}{dx}\left(\left(x-2\right)^2+\left(y-8\right)^2=25\right)$
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