$\frac{2x+2}{\left(x+1\right)}$
$\left(2x-y\right)\left(x-5y\right)$
$100a^4-60^2b+9b^2$
$\lim_{x\to0}\left(\frac{2^x}{x^2}\right)$
$\frac{x^n}{3^n}$
$- 1 - [ - 3 - 2 + ( - 4 ) ]$
$\left(\frac{4}{5}m-\frac{2}{3}n\right)^2$
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