$3-5+7-2+5-8-6+8-3$
$2x^2+3x-1\ge\:0$
$\frac{d}{dx}\left(4cos^2xsen^2x\right)$
$\left(z^{-1}+1\right)^2$
$\left(2m-n\right)^4$
$\sec\left(3.420\right)$
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