$\lim_{x\to\infty}\left(\cos\left(\frac{\pi}{x+2}\right)^{x^2}\right)$
$-13-\left(6-12\right)$
$4^{2\:.}4^2$
$x^2-8x=4$
$\left(d+4b\right)^3$
$\left(2d-1\right)\left(2d+1\right)$
$\lim_{x\to0}\left(\frac{e^x}{14x^{13}}\right)$
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