10. (6 points) If z = f(x, y)where x = s+t and y = s -...

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10. (6 points) If z = f(x, y)where x = s+t and y = s - t, show that (3) (Hint: Start with the right side by using the chain rule) 2 dz - 2 z dz = as at 10. (6 points) If z = f(x, y)where x = s+t and y = s - t, show that (3) (Hint: Start with the right side by using the chain rule) 2 dz - 2 z dz = as at