$3\left(\frac{3}{4}m+\frac{2}{3}n\right)\left(\frac{3}{4}m-\frac{2}{3}n\right)$
$1-sen^2x=1$
$6b^2-78b-625$
$\frac{729}{64}m^3x^{15}-8n^6$
$\int\left(9x^8\left(x^9-7\right)\right)dx$
$\frac{sec\theta\:}{cos\theta\:}-\frac{tan\theta\:}{cot\theta\:}$
$3b^2\left(3n+4m\right)-6cn+8cm$
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