$\left(2^2\cdot5m^2\right)\cdot n^2+9mn-20$
$\lim_{x\to\infty}\left(xsin\left(\frac{3}{x}\right)\right)$
$\left(10m^4-8n^5\right)^2$
$a^{2}+2a\left(a+b\right)+\left(a+b\right)^{2}$
$-\left(-6\right)^2$
$2.58+3.5$
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