QUESTION 25 Which one of these represents the first order partial derivatives of a multivariable f(x.y)=xy3 +In(2x) 1 fx=y3+,fy%3D3×3Y+In(x) fx=y3+.fy3xy? 1 fx=y3+fy33x²y fx=xy3+. 2x fy=3x3y

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