$cotxcsc^2x-cot^3x$
$14a-3b-19a+7b+c+6c$
$x^4+x^3-5x^2+3x$
$\lim_{x\to\infty}\left(\frac{5x^3-9x^2+9}{2x^3+8x^2-8}\right)^{-3x-3}$
$\frac{3}{4}x+4=22$
$-\frac{80}{8}$
$13-\left(-31\right)$
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