Question: Please help with all 3. Thank you so much! 4. A function f of two variables is defined for all r and y by f(x,

Please help with all 3. Thank you so much! 4. A

Please help with all 3. Thank you so much!

4. A function f of two variables is defined for all r and y by f(x, y) = 512 - 2ry + 2y? - 4x - 10y +5 (a) Find the first- and second-order partial derivatives of f. (10 points) (b) Find the only point (x, y) at which both first-order derivatives are 0. (3 points) Let f be defined for all (x, y) by f(x, y) = e--y - e- - e-y . Find the second-order partial derivatives of f. (9 points)

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