55. Let z = f(x – y. y - x). Show that az/ax + az/ay = 0. %3D 56. Let f be a differentiable function of three variables and sup- pose that w = f(x – y, y – 2. z - x). Show that aw aw aw = 0 + az ax ду

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Q: 12. Suppose that f(x, y, z, w) = 0 and g(x, y, z, w) = 0 determine z and w as differentiable…

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A: for f(x) to be continuous at (0,0) limx→0+,y→0+f(x,y)=limx→0-,y→0-f(x,y)= f(0,0)

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