$4a^4-81b^2$
$\lim_{x\to16}\left(\frac{4-\sqrt{x}}{16x-x^2}\right)\:$
$\frac{dy}{dx}=\frac{\left(-1-0.01y\right)}{\left(1+x\right)^2}$
$\cos\left(7x\right)\sin\left(9x\right)$
$\sin\left(85\right)=\cos\left(40\right)$
$-5\left(-2\right)+\frac{-9}{3}$
$\frac{d}{dx}\left(\frac{x^3+1}{x^3-1}\right)^3$
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