$\left(\frac{2}{3}a^3b^4c^{-3}+11ab^2\right)^2$
$4x+2x^2-6x+x^2$
$\frac{x^4+3x^39x-1}{x-1}$
$\lim_{x\to2}\left(\frac{x^2-4x^3+4x^2}{x-2}\right)$
$2x>4+3x$
$\frac{\sec\left(\frac{x}{2}\right)}{\csc\left(\frac{x}{2}\right)}$
$\int\frac{5}{x^2+9}dx$
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