$\left(q^{-4}\right)^{-9}$
$\lim_{x\to1}\left(\frac{x^3-1}{\ln\left(x\right)}\right)$
$\frac{dy}{dx}+\sec\left(x\right)y-\cos^2\left(x\right)=0$
$2ydx\:+\:x\left(lnx-lny-1\right)dy=0\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$4x^{2-9}$
$15a+21a-13a+8a-12a+7a$
$\int\:\frac{1}{t^2\sqrt{3-t^2}}dt$
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