$\frac{d^2}{dx^2}\left(3x+5\right)^9$
$\int sec^2\left(6x+8\right)dx$
$\lim_{x\to0}\left(\frac{cos4x}{xtan2x}\right)$
$\frac{dy}{dx}=\left(y-4x-1\right)^2$
$20x+4=4$
$\:x-26=\:42$
$\left(\frac{2}{3}x^2y-\frac{1}{4}\right)\left(\frac{2}{3}x^2+\frac{1}{4}\right)$
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