$\:2a\:+\:ab$
$y+xy+y^2+3xy$
$\left(2x+11\right)\left(2x+7\right)$
$x^3\left(y^2-1\right)dy=\left(x+3\right)y^5dx$
$\int x\sqrt{x^2-12}dx$
$\left(-12\right)\left(-8\right)\left(-1\right)$
$\int\frac{4+z}{4\left(z^2+4\right)}dz$
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