Let f be a function with continuous second partial derivatives and define: = = ƒ (xy³, 12) f if you take; u = ry³ and w = is obtained: 02 From the above it is concluded that: 2 A) Zxy = 3y² fu+y³ fuu - 73 fwu B) Zry=3y² fu + 3xy³ fuu C) Zry = 3y² fu+y³ fuu D) Zry=3y² fu- - 6y² x² - 6y² x2 6y² x2 -fwu fuu 2 1/2 = y³ · fu - 22³3 · fw. . Əx -fwu + 3xy³ fuu + fww

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