The magnitude of the directional derivative of the function f(x, y) = – McqOptions

MCQOPTIONS

1.	The magnitude of the directional derivative of the function f(x, y) = x2 + 3y2 in a direction normal to the circle x2 + y2 = 2, at the point (1, 1), is
A.	4√2
B.	5√2
C.	7√2
D.	9√2
Answer» B. 5√2

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