Let f(x,y) xxy+ yy. Find the directions u and the values of D,f(1, 1) for which the following is true a. Duf(1, 1) is largest b. Duf(1, 1) is smallest d. Duf(1, 1) 4 c. Duf1, ) 0 e. Duf(1, 1)3

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A: See the attachment

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A: Here , x=gt , y=ht , z=fx,yg3=2 , g'3=5 , h3=7 , h'3=-4 ,fx2,7=6 , fy=2,7=-8 and t=3

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A: follow next step

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A: The solution is given as

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A: According to question we need to find for (x,y) = (1,1) So, I am assuming there is a typo in options…

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A: The given function is:    f(x,y,z)=ln2+x2-2y2-3z

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A: Explanation of the answer is as follows