$\frac{64a^3+b^9}{4a+b^3}$
$x^3+2-4x^2+x-5$
$x2\:+\:7x+\:81=0$
$\left(x^2-5x^2\right)^2$
$\left(5t-10\right)\left(5t+10\right)$
$\int\frac{1}{1+2sen^2x}dx$
$-x^2-9x-22$
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