The directional derivative of f(z, y, a)-y-y': at the point (3, 2, 1), in the direction...

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The directional derivative of f(z, y, a)-y-y': at the point (3, 2, 1), in the direction of the tangent line of the curve )- (3 cos(t-1), 21, e) is Which of the following is the value of a? a--16 a 13 a- Vi3 a--10 69 The directional derivative of f(z, y, a)-y-y': at the point (3, 2, 1), in the direction of the tangent line of the curve )- (3 cos(t-1), 21, e) is Which of the following is the value of a? a--16 a 13 a- Vi3 a--10 69

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