$x-\frac{3}{1+x}$
$3.2^2\cdot3.2$
$\frac{dy}{dx}=x^8y$
$\frac{d}{dx}\:sen\:\left(2x^2+3\right)+cos\:2x$
$3a^6+6a^3+3$
$4\left(\frac{1}{x-2}\right)^2-\frac{7}{x-2}-2$
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