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Q7. Please derive the total differential of z(x, y) = (x3 + y3)xty. (10 points) a (In z) dx + Hint: z= ( x2 +

Q7. Please derive the total differential of z(x, y) = (x3 + y3)xty. (10 points) a (In z) dx + Hint: z= ( x2 + y2 ) x+y - Inz = ( x + y) In(x2 + y2) - dlnz= ax a(in z) dy ay

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