The rate at which one variable quantity changes with respect to another.

For a function y = f(x), the derivative at point (x,y) represents the limit of the gradient of a chord connecting two points on a curve as the distance between the points approaches zero. It is the slope of the tangent to the curve y = f(x) at that point, normally denoted by f´(x) or dy/dx.

Related Terms: differentiation, integration

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