$cosx\cdot1-sinx\cdot0$
$\left(xy+1\right)^2$
$\frac{dy}{dx}=\left(y-5\right)^2e^x$
$\frac{1}{5}\left(13-8\right)$
$\frac{\left(x+2y\right)^2+\left(x-2y\right)^2}{x^2+4y^2}$
$\frac{dy}{dx}=\frac{x+9}{y-9}$
$7gn^4-14n^2$
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