$\frac{cosecx-cotx}{sinx}=\frac{1}{1+cosx}$
$x^{30}-2x$
$5400-3250$
$2v-2\le3v$
$20x^3-12^3-12x$
$\lim_{x\to1}\left(\frac{\left|x\right|-1}{x-1}\right)$
$\left(\frac{x^{-2}y^4\cdot2y^3}{\left(2y^3\right)^{-1}}\right)^3$
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