$x^2-x\ge20$
$cos^2tcot^2t-sin^2tcsc^2t$
$-16x^4\left(-5x^4y^5\right)$
$2013-7$
$-608+-791$
$\lim_{x\to0}-2x^3$
$\lim_{x\to-4}\left(\frac{x^2+3x-4}{x^2+8x+16}\right)$
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