What does this equation mean? Shouldn't the solution be a 1x3 matrix instead of a value?

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If we have a function

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then what is

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equal to?

The solutions are all single values, but if D(1,2,3) is the jacobian matrix on the point (1,2,3) and f(3,2,1) the function on that point, it should give a 1x3 matrix?