$4k^3w+20k^2w^2+25kw^2$
$\frac{x^2+4x+4}{2x-4}$
$xy-2x$
$\left(4a^4+2\right)\left(-4a^4+2\right)$
$\left(9\cdot10^3\right)+\left(4\cdot10^3\right)$
$\int\frac{1}{x\sqrt{81x^2+25}}dx$
$\int\left(x^5+2\right)^3.3x^4dx$
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