6524123 Essay

827 words - 3 pages

Concepts of Calculus Calculus was invented independently by two mathematicians, Issac Newton of England and Gottfried Wilhelm Leibniz of Germany in the 1680s. Leibniz published his research in the journal Â¡Â¥Acta EruditorumÂ¡Â¦ in 1684 and Newton Â¡Â¥s treatise was published in Â¡Â¥Principia MathematicaÂ¡Â¦ in 1687.Calculus was mainly developed to solve two types of problems Â¡V the determination of tangents to curves, fig.1, and the calculation of area, fig. 2, especially for irregular shapes. Both of these problems are closely related to the rate of change of continuous function and the fundamental concept of calculus (also known as the Â¡Â¥limitÂ¡Â¦). The following shows what limit is and what are its applications.Fig.1 Given a function f(x) and a point P(x,y) on its graph, find an equation of the line tangent to the graph at P.Fig.2 Given a function f(x), find the area between the graph of f(x) and an interval [a,b] on the axis.In plane geometry, a line is called a Â¡Â§tangentÂ¡Â¨ to the circle if it meets the circle at precisely one point, fig.3a. However, this definition is not correct for all kinds of curves and irregular shapes. In fig.3b, the line meets the curve exactly once, yet it is not a tangent. Meanwhile in fig.3c, the line is a tangent, yet it meets the curve more than once.Fig.3 For tangent that applies to curves other than circles as in fig.4a, point P on curve in the xy-plane and Q is any point on the curve different from P, the line through P and Q is the Â¡Â¥secantÂ¡Â¦ line (the secant line is a line that intercepts a curve at at least two points). If Q moves along the curve toward P, fig.4b., the secant line will rotate toward a Â¡Â¥limitingÂ¡Â¦ position. The line occupying this limiting position is considered to be the tangent line at P.Fig.4 The area of the plane regions also leads to the concept of a Â¡Â§limitÂ¡Â¨ (the approximated area of a curve). Area of some plane regions can be calculated by subdividing them into finite number of rectangles or triangles, then adding the areas of its parts, fig.5. In calculus the area of an irregular shape can be approximated by inscribing rectangles of equal width under the curve and adding the areas of these rectangles, fig.6. If the...

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