$\lim_{x\to a}\left(\frac{x^3-ax^2-a^2x-a^3}{x^2-a^2}\right)$
$x^2-27x+180$
$\lim_{x\to\infty}\left(\frac{2^{2n+1}}{2^{2n}}\right)$
$3 y = 0$
$5k^2+4k-9$
$2x^2+5x+6.25$
$x^4+5x^2+6$
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