$\frac{d}{dx}x^2+xy-y^2=-11$
$2\int\frac{1}{\left(4x^2+1\right)\left(2x+1\right)}dx$
$-8x^7+24x^6+12x^5$
$\left(-5y^4\right)\left(7y^2\right)$
$x^2+3x-2x-6$
$\frac{2x^3-x^2-9x+4}{x-2}$
$xy\left(x^4y^4\right)$
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