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Multiple choice
Which of the following expressions represents the formal definition of the directional derivative of a function f(x, y) in the direction of a unit vector u = cos θ i + sin θ j?
A
f_x(x, y) cos θ + f_y(x, y) sin θ
B
f(x, y) - f(x0, y0)
C
∇f(x, y) • u
D
lim (t->0) [f(x + t cos θ, y + t sin θ) - f(x, y)] / t
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