$\lim_{x\to\infty}\left(\frac{1}{3}\right)^{x-2}$
$2x\sqrt{2}$
$16m^2-72mn+81n^2$
$x+7\sqrt{x^2}-2x-65$
$\int\left(\frac{y-1}{\sqrt{y^2-2y+1}}\right)dx$
$-13x+11;\text{si}x=2$
$\frac{2}{\left(3n-1\right)\left(3n+2\right)}$
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