Question: 5) a) Find the direction in which function f(x,y,:) : i y: at the point (4,1,1) 1' decreases most rapidly. What is the value of

5) a) Find the direction in which function f(x,y,:) : i y: at the point (4,1,1) 1' decreases most rapidly. What is the value of the directional derivative in this direction? b) Calculate the directional derivative in the direction of the vector in the plane 2:! that makes the angle :9 2% with the x-axis

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