$42^2-38^2$
$x^2-3x-20$
$\left(y-1\right)dx-xdy=0$
$\left(-4ab^3\right)^3$
$x^3y+5x$
$\sin\left(\frac{y}{2}\right)\frac{dy}{dx}=\cos\left(3x\right)$
$t\frac{dx}{dt}+x=2t$
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