$\lim_{x\to\infty}\left(\frac{\cos\left(\pi x\right)-1}{\sqrt{x}-2}\right)$
$8x^2-36x^2+36x-27$
$-4^4$
$750+50x>1000$
$\sqrt[1]{36}$
$5\cdot\left(-7\right)^4+30\left(-7\right)^3$
$\left(n^2-1\right)\left(n^2+20\right)$
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