Hi, Could you explain me this rearrangement? Thanks in advance
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It looks like they've started by expanding the square.
That's pretty much it: $\displaystyle (a- b)^2= a^2- 2ab+ b^2$. Here a= T and $\displaystyle b= \frac{H}{\nu_s}$. Then, of course, multiply each term by $\displaystyle \frac{g}{2}$.
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