$\frac{d}{dx}\left(\left(4x^2\right)\left(x^2-2\right)\right)$
$5x^2-7+2$
$\int\frac{x}{2x^2-11x-21}dx$
$\frac{d}{dx}\left(\sqrt{1+x^2+y^2}\right)$
$7x-21$
$-2x^4+4x^3+6x^2$
$14x\:+\:9=22x+1$
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