$\frac{5x^3+7x}{2x^2-4x+5}$
$20+90+51e$
$\int\frac{4}{cos2x}dx$
$x^2-20x+9$
$\frac{3a^2+3^3}{3a-3}$
$x^6-16x^4y$
$\frac{1}{\sqrt{x}}-\sqrt{x^3}$
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