$\frac{du}{dx}=e^{3u+7x}$
$\lim_{x\to0}\left(\frac{\sin\left(2x\right)}{\ln\left(x+1\right)\cos\left(x\right)}\right)$
$r\left(r-1\right)$
$\frac{x^5+x^3-20x}{x+2}$
$6a^3b+18a^2b^2+30ab^3$
$\frac{120}{4}$
$\frac{1}{4}x^2-25y^2$
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