$\lim_{w\to0}\:w^2\left(2w^6-3w^4\right)^{-1}$
$\lim_{x\to0}\left(\frac{e^x-e^{-x}}{x^2}\right)$
$3y^2-8y-2$
$\left(2x^2+4y^2-6x\right)\cdot\left(2x^3-6y^2-2\right)$
$121b^6-c^4$
$\int36xe^{6x}dx$
$2\cdot\:\frac{dy}{dx}-y=0$
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