January 25th, 2013 Antiderivatives & Indefinite Integration (4.1)

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January 25th, 2013 Antiderivatives & Indefinite Integration (4.1)

I. Antiderivatives Def. of an Antiderivative: A function F is an antiderivative of f on an interval I if F’(x)=f(x) for all x in I. *Since the derivative of any constant C is zero, it is impossible to find a single function f for which F is the antiderivative..

Thm. 4.1: Representation of Antiderivatives: If F is an antiderivative of f on an interval I, then G is an antiderivative of f on the interval I if and only if G is of the form G(x)=F(x)+C, for all x in I, where C is a constant. *Given a function, the function represents all possible antiderivatives of f, so it is the general antiderivative of f, where C is called the constant of integration. We would also say that is the general solution of the differential equation. Keep in mind that a differential equation of x and y is an equation that involves x, y, and the derivatives of y.

II. Notation for Antiderivatives Given a differential equation, or dy=f(x)dx, finding all of the solutions of this equation is called antidifferentiation, or indefinite integration. The solution is integral sign integrand variable of integration Constant of integration *indefinite integral=antiderivative

III. Basic Integration Rules *Integration & differentiation are inverses, thus *In addition, all the basic integration rules are mainly just the differentiation rules you’ve already learned, but in reverse. Also, you can’t integrate products and quotients piece by piece, just like with differentiation. and

Basic Integration Rules: Differentiation FormulaIntegration Formula

Differentiation FormulaIntegration Formula

Ex. 1: Find the indefinite integral a. b. c. d.

IV. Initial Conditions & Particular Solutions Ex. 2: Solve each differential equation. a. b.