$\frac{d^2}{dx^2}\left(2\cos\left(x\right)-3\sin\left(x\right)\right)$
$\frac{dy}{dx}-3y=-9x$
$4x^4-64x^2$
$-7x-2$
$1x^2-9$
$\frac{dy}{dx}=30+36x+15y+18xy$
$5x^0+20^0$
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