$x^4+2x^3+x^2-4$
$x+1=3x-3$
$2-\frac{y}{x}$
$\frac{1-\sin^2x}{\cot^2x}$
$\left(10x-4\right)\left(10x+6\right)$
$\int x^2\left(x^2-81\right)^{\left(\frac{3}{2}\right)}dx$
$\lim_{x\to1}x-\sqrt[3]{2-3x^2}$
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