$\frac{2}{\left(x^{2+2x}\right)}$
$\frac{s^3-t^3}{s-t}$
$x^2-18x+x$
$\left(1-\sin^2\left(x\right)\right)^2$
$\frac{dy}{dx}=\left(x-y-1\right)^2$
$\frac{3}{\left(x+4\right)^2}$
$t\cdot x'+x=e^t$
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