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 \(\hat a = 3\hat i - 4\hat j\) is
A.	-4
B.	-2
C.	-1
D.	1
Answer» C. -1

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