$b^2+6b+9$
$20 = r + 11$
$2x^2-8x+6$
$\left(8x^2\right)\left(8x^2\right)$
$\frac{13.51692}{20}$
$3a^3\:b\:c^2\:cuando\:a=2\:b=-1\:y\:c=3$
$\lim_{x\to0}\left(\left(\frac{1}{x}-cotx\right)\right)$
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