$18-60x+50x^2$
$66+45-165-123+867$
$\left(x^y+x^{-4}\right)^2$
$2-4x<-8-2x$
$\left(4x^7-x^5-\frac{4}{7x^4}-8\right)$
$\lim_{x\to\infty}\left(\frac{10x}{x^2+1}\right)$
$\csc x+\sin x=\cot x\cdot\cos x$
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