$\frac{dy}{dx}=2sin\left(x\right)-y$
$27x^2+18x+9$
$2.9\:.\:\left(-0.4\right)$
$cos3x-cosx$
$6x^2-4x\:-\:16$
$\frac{d}{dx}x^4+y^4=0$
$\frac{7x^3-6x^2-12x}{-3x}$
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