BreakingBad wrote:Regarding 1: http://math.stackexchange.com/questions ... the-images
Regarding 2: What is the definition of "moment"? Seems obscure to me.
Regarding 3: Notice that the equation can be written as F(x,y,z) = F(x,y,f(x,y)) = 0. By the chain rule, (dF/dx) + (dF/dz)(dz/dx) = 0. Rearranging gives the answer with the negative sign.
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