$4b\:2\:x\:4b\:2\:$
$35x^3-21x^4y+28x^5y^2-7x^2y^3$
$\frac{x-4}{5x+2}\:=\:\frac{x\:+\:10}{3x+18}$
$\lim_{x\to\infty}\left(4x^6+x^3-1\right)$
$\left(\sqrt{2x^2}\right)^3$
$\frac{dy}{dx}=\frac{-y}{1+x^2}$
$\left(\frac{2n^3+3n^2+n}{6}\right)$
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