The directional derivative of the function f(x, y) = x + y along a l – McqOptions

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1.	The directional derivative of the function f(x, y) = x + y along a line directed from (0, 0) to (1, 1), evaluated at the point x = 1, y = 1 is
A.	2
B.	4
C.	2
D.
Answer» D.

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