$\lim_{x\to0}\left(\frac{3x-\tan\left(2x\right)\:}{3}\right)$
$1\frac{d}{dx}$
$\frac{4x^{3}+4x^{2}+2x-1}{x^{3}+3x^{2}+3x+1}$
$\frac{d}{dx}\sqrt{x^4}$
$x^2+2x^2-8x$
$\left(4m+3n^3\right)^2$
$\int\frac{7x+39}{x^2+8x+15}dx$
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