$y+1\frac{dy}{dx}-4x=0$
$5\:sen3x\:-\:2\:=\:-4sen3x\:$
$46\cdot47\cdot48$
$1-\frac{1}{1-\frac{2}{3}}$
$\frac{dy}{dx}=\frac{x\sin\left(x\right)}{4ye^y}$
$\cot\left(-x\right)\sin^2\left(x\right)\sec\left(x\right)=-\sin\left(x\right)$
$\frac{-x^2+ax-x}{x^2-a^2}$
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