$\int\left(-\frac{6}{5x-9}\right)dx$
$3\left(8\right)^4-3\left(8\right)^3-\left(8\right)^2+3\left(8\right)-1\:$
$-0.8\cdot2$
$2x+7\cdot2xy$
$2senx-1=senx$
$\left(mn-5\right)^3$
$\left(a^2x^{-2}-a^3x^3+a^4x^{-4}\right)\left(ax^{-1}+a^2x^{-2}\right)$
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