$\left(6x-6y\right)\left(6x+6y\right)$
$x2+20=12x$
$\lim_{x\to0}\left(\frac{1}{sen\left(x\right)}-\cot\left(x\right)\right)$
$12.005+9.72+12.90$
$-\left(-417\:-\:78\right)\:-\:\left(-518\:-\:287\right)$
$+3b-c+5a-8b-4c$
$\left(y-10\right)^3$
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