$\frac{d}{dx}\left(tanx^{tanx}\right)$
$\lim_{x\to0}\left(\frac{-\sin\left(4x\right)}{2x}\right)$
$2y^23x$
$\left(z^7-7\right)\left(z^7+7\right)$
$\frac{dy}{dx}=3x-4$
$x-y+3y-2y-4x$
$\int\frac{4f}{x\left(x^2+1\right)}dx$
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