Question: In Exercises 13 through 24, find the indicated partial derivatives by holding all but one Of the variables constant and apply- ing theorems for


In Exercises 13 through 24, find the indicated partial derivatives by holding all but one Of the variables constant and apply- ing theorems for ordinary differentiation. 13. f(x, y) Dif(x, y) 15. f(8, 4) sin 38 cos 24; D2f(e, O) 18. r = e-9cos(8+ 4); 21. f(x, y, z) = 4xyz + In(2xyz); f3(X, y, z) 14. 16. 19. 22. f(x, y) = D2f(x, y) f(r, 8) cos 2r tan e; D2f(r, 8) 20. u = f(x, y, z) sinh 2z cosh 2z; f3(X, y, z)
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