A way of making calculations about continuously varying quantities such as the speed of a falling object or the slope of a curve.

Calculus is divided into two general areas: differential calculus, which is concerned with finding the rate of change of a function, and integral calculus, which uses a limiting process to obtain gradually better approximations to the true value. Integral calculus arose from the problem of trying to compute the area within a curved boundary, which cannot be found simply using the conventional formulas for calculating the areas of polygons.

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