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Math Help - rearrangement

  1. #1
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    rearrangement

    Hi,
    Could you explain me this rearrangement?
    Thanks in advance

    rearrangement-untitled-1.jpg
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  2. #2
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    Re: rearrangement

    It looks like they've started by expanding the square.
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  3. #3
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    Re: rearrangement

    That's pretty much it: (a- b)^2= a^2- 2ab+ b^2. Here a= T and b= \frac{H}{\nu_s}. Then, of course, multiply each term by \frac{g}{2}.
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