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Please Solve !! Question 2. Calculation (5 marks) If z = f(x, y) for some function f with continuous partial derivatives up to order 2

Please Solve !!

Question 2. Calculation (5 marks) If z = f(x, y) for some function f with continuous partial derivatives up to order 2 and x = s+t, y = s -t, show that Oz 2 Oz 2 Oz Oz = Ox ay as at

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