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Find the directional derivative of f(x, y) = sin(x + 2y) at the point (3, 1) in the direction 0 = 5/6. The gradient

Find the directional derivative of f(x, y) = sin(x + 2y) at the point (3, 1) in the direction 0 = 5/6. The gradient of fis: Vf= Vf(3, 1) = The directional derivative is:

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