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Math Nerd Badly Needed!

  1. Nov 29, 2009 #1
    I need to derive the following equation with respect to R3. This is the equation for a Wheatstone bridge. Unfortunately I am not very good at derivations. Here is the equation:

    I came up with the following answer but was told that it is wrong:
    dVO/dR3 = ((1/(R2+R3))-(R3/(R2+R3)2)VS

    If you want to be a real sport, set R1=R3 and derive the same expression.
  2. jcsd
  3. Nov 29, 2009 #2
    Suppose [tex]y=((x/(12+x))-(4/(12+4)))\cdot 6[/tex], can you do dy/dx now?
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