$16x^2-121$
$\left(x+1\right)^2\left(x-1\right)^2$
$\lim_{x\to0}\left(\left(5x\right)\:\ln\left(x\right)\right)$
$10w\sqrt{w}$
$\tan a.cot\:a-sen^2a$
$\frac{3w}{y}+4x-2$
$y=\left(x-2\right)^2$
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