$\frac{64x^5}{72x^9}$
$x3+27$
$\left(a^2+4\right)\left(a^2\right)$
$\lim_{x\to0}\left(\frac{arctan\left(x^4\right)}{x^3}\right)$
$\int\:\frac{\sqrt{x\:}\:}{x+2}dx$
$\frac{3\sen\left(t\right)+\tan\left(t\right)}{\tan\left(t\right)}$
$\left(2x+4\right)\left(2x+8\right)$
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