4. Consider a function f(x,y)=x? y. What is the direction in which maximum change of the...

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4. Consider a function f(x,y)=x? y. What is the direction in which maximum change of the function takes place at the point (2,2)? Find the derivative of f(x,y) in the direction of (1,2) at the point (3,2). 4. Consider a function f(x,y)=x? y. What is the direction in which maximum change of the function takes place at the point (2,2)? Find the derivative of f(x,y) in the direction of (1,2) at the point (3,2).