$4+4i$
$a^2+ab+a+ba+b^2+b-a-b-1$
$2x+10m^2$
$1+18x+81x^2$
$\frac{am}{ay}\:x^2sen\:x\:$
$dx-e^{-3x}dy=0$
$\lim_{x\to\infty}\left(\frac{x+3}{x^2-9}\right)$
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