$\left(2x^2-3x+4\right)^2$
$\left(\sec x-1\right)\left(\sec+1\right)$
$\left(40-2x\right)^3$
$\left(x-y\right)ydx-x^2dy=0$
$\frac{3x-9}{x^2-8}$
$\sin1-x^{-2}$
$\left(sin\:\alpha\:+1\right)x\left(sin\:a-1\right)$
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