$x^{2}-120x+144$
$-2x<0$
$\frac{\csc\:^2\left(u\right)+\sec^2\left(u\right)}{\csc\:^2\left(u\right)\sec\:\left(u\right)}$
$\frac{2x^{2}-7x+3}{3x^{2}-10x+3}$
$e^{7x}\frac{dy}{dx}=2e^{3x+5y}$
$x^2+x-156$
$\frac{\cos^2u}{\sin^2u}\left(\sin^2u\right)$
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