$-5x^2+15x+2$
$\left(8x^2-y^8\right)^2$
$_-\frac{5}{6}-\frac{2}{3}$
$2\left(2x^3y^4\right)^2\left(-3xy^2\right)$
$\frac{x^4+18x^2+81}{x-1}$
$k=\frac{-2cos2xsenx+2cos4xsenx}{2sin3xsen2x}$
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