$-5.4-\left(-2.3\right)$
$\frac{dy}{dx}=\frac{-y^3}{x^2}$
$y'+y\cos x=4\cos x$
$5x^3-3x^3$
$2x^2-x^2-1$
$\frac{x^5}{x^2+9}$
$\:\frac{cot\theta\:}{tan\theta\:\:}$
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