The derivative of f equals the limit as Dx goes to zero of f xDx - f x over Dx Or sometimes the derivative is written like this explained on Derivatives as dydx. Let z fx y be continuous on an open set S. Substituting in the point 1 2 3 we get.
Next add all the squared numbers together and divide the sum by n minus 1 where n equals how many numbers are in your data set.
As a special application of the chain rule let us consider the relation defined by the two equations. To get a derivative. X 3x yz y w. Z f x y.