$y'=4x-9x^2-6x^5$
$17x^2\:+\:x$
$\log_x\left(x+4\right)+\log_x\left(x-2\right)$
$\lim_{w\to0}\left(\frac{w+w^2}{w-w^2}\right)$
$\sqrt{45x^2}$
$cos^2\left(x\right)+sin\left(x\right).sin\left(x\right).cos^2\left(x\right)$
$x^2-10+90$
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