$\frac{2x^2-15x+25}{2x^2+10x}$
$\int3x^2\sqrt{3-x^3}dx$
$x^2-16x+81$
$\lim_{x\to0}\left(\frac{sen\left(ax\right)}{sen\left(bx\right)}\right)$
$x^2+x^{-2}$
$49m^2+56m+16$
$-3x^2-5xy+x-1\:-\:3xy-7x^2-3x-6$
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