4. x* · y f(x, y) (x, y) # (0,0); x4 + y2 f (0,0) = 0, (x, y) = (0,0). Calculate a formula for the partial derivative valid at every (x, y) # (0,0). af

Q: f(x, y) = 22f дх2 2² f дуг = 2x — 8y 7x² +5y m --- 00

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Q: - f(x, y) = tan 22 f 0x2 22f дуг = a² f дхду = ду X

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