$4x^2-441$
$\frac{3x}{\sqrt{2}}$
$\left(a^{\frac{1}{2}}\:-a\right)\:\left(a^2\:+a\:^{\frac{1}{3}}\right)$
$\frac{sen\left(x+y\right)-sen\:\left(x-y\right)}{2cos\:x}$
$\frac{d}{dx}\left(\frac{x}{3x^2+1}\right)$
$y=3x^{-2x}$
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