$\int9x\sqrt{-x^2+4}dx$
$\int_{\pi}^{2\pi}2\cos\left(2x\right)dx$
$7x^2+27x-4=0$
$x^2+y^2=m^2$
$\left(m+n\right)\left(-n\right)$
$-\frac{2}{w}+w^2$
$\int\left(\cot^{-1}\left(13y\right)\right)dy$
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