Show that, if f is a function of the independent variables x and y, and the latter

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Show that, if f is a function of the independent variables x and y, and the latter are changed to independent variables u and v where u = ey/x and v = x2 + y2, then

af af (a) x- + y   (b) x3 af  af  = 2v- af  =  uv- af

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