$\lim_{x\to0}\left(\frac{x^2-6x+9}{x^2-9}\right)$
$2x-3x$
$\lim_{x\to\infty}\left(\left(1-\frac{2}{x}\right)^{0.4x}\right)$
$9,854-5,316$
$p^{18}8^2$
$\left(x^4+2x^2y+y^2\right)\left(x^4-2x^2y+y^2\right)$
$8\:=-\frac{2}{5}c\:$
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