$\sqrt{x^4+2x^3-x^2-2x+1}-\left(x^2-1\right)$
$4\cos^2+2cos=0$
$25m^3+5m$
$\frac{dy}{dx}=e^ysin\left(x\right)$
$\left(z+1\right)\left(z+1\right)^z$
$\frac{dy}{dx}=-\frac{1}{x^2}-\frac{y}{x}+y^2$
$\frac{-2x^3+10x^2-7x+4}{x-4}$
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