ISRO Electrical Engineering (EE) 2019 - Question 36

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The value of directional derivative of a function φ(x, y, z) = xy^2 + yz^2 + zx^2 at point (2, -1, 1) along the direction vector p = i + 2j + 2k is.

  • A. 3
  • B. 5
  • C. 8
  • D. -1

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