Question: In Exercises 6164, determine whether the statement is true or false. If it is false, explain why or give an example that shows it is

In Exercises 61–64, determine whether the statement is true or false. If it is false, explain why or give an example that shows it is false.

If f (x, y) = √1 - x2 - y2, then Du f (0, 0) = 0 for any unit vector u.

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