$6^4\cdot3^4$
$x^2y+xy^2=y^2$
$z^2-144$
$2-4cos2\:-\:2\:senx\:$
$\log_{21}\left(x-84\right)=3-\log_{21}\left(x\right)$
$\int\frac{4}{5}e^2^x+3dx$
$x^{3}+3x^{2}-2x-4$
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