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Which of these statements best defines local derivative?

a) Time rate of change
b) Spatial rate of change
c) Time rate of change of a moving point
d) Time rate of change at a fixed point

Answer: d
Explanation: Local derivative is the term \(\frac{\partial}{\partial t}\) of a property. This defines the time rate of change of a property at a particular point with the assumption that the point is fixed.

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