$\lim_{x\to0}\left(\frac{x\cdot\sin\left(x\right)}{2-2\cos\left(x\right)}\right)$
$-2r+4r$
$cos\left(tan^{-1}\left(\frac{x}{3}\right)\right)$
$\frac{dy}{dx}=\frac{8x}{7y}$
$4x^2-20x$
$1-8h^6$
$-4b\:-\:6b$
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