$\lim_{x\to64}\left(\frac{x-64}{\sqrt{x-8}}\right)$
$5x^2+30x+45$
$11x^2+21x-2$
$5y^2+4y+7+y^2-4-5y+3$
$\frac{8x^2+20x^3}{4x^2}$
$\sqrt{\left(9-1\right)}^2+\left(1-1\right)^2$
$\left(a^{n+1}+a^{n-1}\right)^2$
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