$\lim_{x\to0}\left(\frac{4x^3\left(e^x-1\right)}{\left(1-\cos\left(2x\right)\right)^2}\right)$
$\frac{d}{dx}\left(\frac{7x+3}{4x-5}\right)^7$
$|128|\:$
$x^2-20x-300$
$-\frac{r}{4}\le2$
$\left(3y^2-4\right)dy=3x^2dx$
$2x^2+20x+44=0$
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