$49^2-36y^2$
$\lim_{x\to0}\left(\frac{x^2+456x}{8senx}\right)$
$x^2-16x+8$
$\lim_{x\to0}\left(tan\left(6x\right)\right)$
$2=\frac{x-2}{x-3}$
$100x^2y^8-49z^4$
$11q+8+q$
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