Let f be a function with continuous second partial derivatives and define: z = f (2x³y - y₁y³) if you take u = 2x³y - y and w = y³ is obtained: (22³1) fu + 5y¹.fw From the above it is concluded that: อะ A) Zyx = 30x²y5. fwu + (12r5y − 6x²y) · fuu + 6x² · fu - . ду B) Zyx = 6x²y (2x³− 1). fuu + 6x² fu + 6x²y. fwu D) Zyx = 6x² fu 6x²y + 5y4. fwu 6x²y . = . - C) Zyx = 6x². fu+ (2x³ − 1) · fuu + 5y¹. fwu · 6x²y .

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