$y^{-2}=-e^{-x^2}+c$
$\left(\left(-2\right)\left(-4\right)+\left|-32-\left(-13\right)\right|\right)-3$
$\lim_{x\to0}\left(\frac{x^3+4x^2-5x+2}{x^3-3x-2}\right)$
$\lim_{x\to1}\left(\frac{x-4}{1-\sqrt{5-x}}\right)$
$2x^2-2x-1$
$\lim_{x\to\frac{\pi}{2}}\left(1-tan\left(\frac{x}{2}\right)\:sec\:x\right)$
$\lim_{x\to0}\left(\frac{\left(x-a\right)}{aln\left(\frac{x}{a}\right)}\right)$
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