$a^4\cdot a^8$
$9z^2-1$
$\frac{1}{\sqrt{4+2x}}$
$\frac{d}{dx}\frac{-x^3}{y^3}$
$6b+7b-10$
$a\:b^3-a$
$\lim_{x\to1}\left(\frac{2x^2+x-3}{x^4+4}\right)$
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