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(1 point) Find the directional derivative of f (x, y) = Sin(x + 2y) at the point (-1, -2) in the direction 0 = 31r/4.

(1 point) Find the directional derivative of f (x, y) = Sin(x + 2y) at the point (-1, -2) in the direction 0 = 31r/4. The gradient of f is: W =( , ) Vf(1,2) = The directional derivative is

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