Question: For f(x, y) = 4x sin(ry) at the point (5, 3), the direction in which the maximum rate of change occurs is: 113.1807 X Invalid

For f(x, y) = 4x sin(ry) at the point (5, 3), the direction in which the maximum rate of change occurs is: 113.1807 X Invalid notation. (Your answer should be a unit vector.)
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