$\lim_{x\to\pi}\left(cscx-cotx\right)$
$10p+6q-4p-4p$
$\left(29\right)\left(-2\right)$
$\frac{3}{5}mn+\frac{9}{25}mn+\frac{3}{5}mn$
$\sqrt{9a\cdot b^6\cdot c}$
$m^2+2m-5\:entre\:m-1$
$\frac{x^2-1}{\:x^2+3x+2}$
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