$\left(\frac{2}{t}6\sin\left(3t\right)^2+3t^{\frac{1}{2}}\right)$
$x^2-3x<0$
$\int\:\:\frac{lnt^2}{t}dt$
$3-11a+10a^2$
$4yx^2-4y^2x$
$\frac{d^2}{dx^2}\left(\sqrt{x+y}+xy=21\right)$
$\frac{cos^2\left(3x^2+1\right)}{x^4-3}$
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