$\lim_{t\to1}\left(\frac{\left(t-1\right)^2}{t^2-1}\right)$
$2-\left[10-\left(-2\right)\left(5\left(2\right)-1\right)\right]$
$\sqrt{2025}$
$209^2-45$
$1-7cosx=8$
$6x+5-3x-1$
$\left(2-3b\right)^3$
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