$-3r^7\left(5-6r^2\right)$
$\lim_{x\to0}\frac{1-e^x}{\ln\left(2-e^x\right)}$
$1-2cos^2x=sin^4x-cos^4x$
$\frac{d}{dx}e^{x^2}-y$
$e^y\frac{dy}{dx}=\frac{2-x}{y+1}$
$4w-w^2$
$\int\frac{3x+1}{x^3+2x^2}dx$
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