$\int\frac{\left(4x^2+8\right)}{x^4+4x^2}dx$
$y^2-x-4=0$
$\lim_{x\to4}\frac{x^2+x-20}{x^2-17x+52}$
$\frac{d}{dx}\sqrt{3x^2-3x-2}$
$\frac{4t}{2}-10$
$x^4+6x^3-x^2-6x$
$x^2-x+xy$
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