$-3y^3+18-9y+6y^2$
$2\cos\left(x\right)=\cos\left(2x\right)$
$\left(2x^2-2y^2\right)^2$
$\left(1-\cos^2x\right)\sec\left(x\right)=\sin^2x\sec\left(x\right)$
$\frac{dy}{dt}=-\frac{2}{t}y=t^3-t$
$\sqrt[3]{81b^7}$
$\int t\sinh mt\:dt$
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