$cosx+sen2y=0$
$\left(a^{-1}b^{-1}c^{-1}\right)^2$
$\left(a^2\:b^3+5\right)^2$
$\lim_{x\to4}\left(\frac{5x^2+10x}{x^2-6x-16}\right)$
$2x^2-4xy-6x^2$
$p^2-12pq-36^2$
$\left|138\right|$
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