$\frac{dy}{dx}=40-\frac{6y}{200-x}$
$\ln e^{-4x}$
$25x^6-4y^2$
$\frac{cos2x-sin2x+1}{sinx-cosx}$
$\frac{1}{3}x+8x^4-\frac{2}{3}x^2-x$
$\frac{x}{x-3}\le-1$
$36x^4-25x^8+30x^4y^2-9y^4$
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