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$3x^2+4x^2-2x-8x+5$
$\lim\:_{x\to\:\:0}\left(\frac{9senx-sen3x}{x^3}\right)$
$24m^2n-2mn-12m^2n-m^2$
$\int\left(tanx-1\right)^2sec^2xtanxdx$
$\left(8x^2-5x+6\right)\left(-8x^2+5x+6\right)$
$6x+1+7x$
$\frac{36+12y+y^2}{2}$
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