In calculus, a differentiator is an operator that takes a function as its input and produces its derivative as its output. The derivative of a function represents the rate at which the function changes with respect to its independent variable.

The symbol used to represent differentiation is the prime symbol (') or the d/dx notation, where dx represents the independent variable. For example, if f(x) is a function, then its derivative with respect to x is denoted as f'(x) or df/dx.

Differentiation is a fundamental concept in calculus and is used in many applications, including optimization, physics, engineering, and economics. The process of differentiation involves finding the slope of the tangent line to a curve at a given point, which can provide important information about the behavior of the function.

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