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by joeframbach 4325 days ago
Think of Derivative as a function which inputs a function and outputs a function. When you think "derivative of 5 is 0", you imply "derivative of f(x)=5 is f'(x)=0"

This article seems to define a function called Derivative which inputs a number and outputs a number. In this case, "derivative of 5 is 1" actually translates to "derivative of 5 is 1".