$\frac{d}{dx}\left(y=cos\left(4e^{3x}\right)\right)$
$\:\left(56\right)\left(53\right)\:$
$8 x ^ { 3 } - 125$
$-6n^2\:.\:2m^{-5}$
$x^2\left(\frac{dy}{dx}\right)-5y=0$
$4x^2-21x+5$
$\frac{x+3}{15}=\frac{x+6}{20}$
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