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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The derivative of a function of a real variable measures the sensitivity to change of a quantity (a function value or dependent variable) which is determined by another quantity (the independent variable).  Derivatives are a fundamental tool of calculus.  For example, the derivative of the position of a moving object with respect to time is the object's velocity: this measures how quickly the position of the object changes when time is advanced." ] ,
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