$xy=\left(1+x^2\right)\frac{dy}{dx}$
$x^2-4x<0$
$x^2dx+2ydy$
$sin^2x-4cos^2=5sin^2x-4$
$-70\cdot80$
$\frac{d}{dx}\left(z^2\ln\left(z\right)\right)$
$\left(-4a+5\right)^3$
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