#derived_function__derivedfunction__derivative__differential_coefficient__differential__first_derivative__firstderivative  the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx
  supertype:  figuring__calculation__computation__reckoning  problem solving that involves numbers or quantities
  subtype:  curvature  the rate of change (at a point) of the angle between a curve and a tangent to the curve

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