The directional derivative of the scalar function f(x, y, z) = x2 + 2y – McqOptions

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1.	The directional derivative of the scalar function f(x, y, z) = x² + 2y² + z at the point P = (1, 1, 2) in the direction of the vector a = 3 - 4ĵ is
A.	4
B.	2
C.	1
D.	1
Answer» C. 1

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