$\left(\frac{1}{3}a^2-\frac{2}{9}b\right)\:\left(\frac{1}{3}a^2-\frac{2}{9}b\right)$
$\frac{dy}{dx}=\left(\sec\left(x\right)+\tan\left(x\right)\right)^2$
$15xy\:y\:-\:19xy$
$2x^3y-2x^2y+2xy-2y$
$20+90+51n$
$^{x^2+10x+2=0}$
$2x+3>3\left(x-4\right)+1$
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