$\sqrt{2}\cos\left(x\right)=-1$
$\left(6x^4\right)+\left(-8x^4\right)$
$\lim_{x\to0}\left(\frac{x\sec^2x-\tan x}{x^2}\right)$
$c^4.c^8$
$\left(x^2-x^{-2}\right)^4$
$125y^3\frac{64}{27}u^3$
$-2753-\left|-275\right|$
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