$\frac{d}{dx}x^3\cdot e^{-3x}$
$\frac{dy}{dx}\left(\cos\left(x+y\right)+\sin\left(x\right)\cdot\sin\left(y\right)\right)$
$\frac{dy}{dx}+y=\frac{1}{1+e^x}$
$\sqrt{-72}$
$\frac{1}{cos\left(cos\left(x\right)\right)}$
$sin\left(y\right)\:dx+\left(1+e^{-x}\right)cos\left(y\right)\:dy=0$
$\frac{1}{2}\:x\:\frac{1}{2\:}\:x\:\frac{1}{2}\:x\:\frac{1}{2}$
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