$x^2-81x+81=0$
$\frac{25}{9}x^2-49y^4$
$\frac{z^2z^4}{z^3z^{-1}}$
$\frac{d}{dx}\left(2\sin\left(5x\right)\right)$
$sen\:x\:+2\:cos\:2y\:=\:1$
$\frac{d}{dx}lnlns$
$+3-1-6-7+4-3-2+11+9+3-22$
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