Not too sure where to start with this, any help would be great.
I have calculated the partial derivitives wrt x and y, but think I am missing the formula where I have to sub in.
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Use "implicit differentiation". If f(x, y)= C (a constant) then . That is, .
Last edited by HallsofIvy; Apr 11th 2013 at 05:41 PM.
Last edited by ducked; Apr 12th 2013 at 10:17 PM.
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