MATHEMATICS Lecture. 4 Chapter.8 TECHNIQUES OF INTEGRATION By Dr. Mohammed Ramidh

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1 MATHEMATICS Lecture. 4 Chapter.8 TECHNIQUES OF INTEGRATION By

2 TECHNIQUES OF INTEGRATION OVERVIEW The Fundamental Theorem connects antiderivatives and the definite integral. Evaluating the indefinite integral, In this chapter we study a number of important techniques for finding indefinite integrals of more complicated functions than those seen before. 8.1 Basic Integration Formulas. In this section we present several algebraic or substitution methods to help us use this table 8-1.

3

4

5 Dr. Mohammed Ramidh

6 EXAMPLE 1: Evaluate

7 EXAMPLE 2: Evaluate

8 EXAMPLE 3: Expanding a Power and Using a Trigonometric Identity Evaluate.

9 EXAMPLE 4: Evaluate,

10 EXAMPLE 5: Separating a Fraction, Evaluate

11 EXAMPLE 6: Integral of Multiplying by a Form of 1, Evaluate.

12 EXERCISES Evaluate each integral in Exercises 1 18 by using a substitution to reduce it to standard form. 2. Evaluate each integral in Exercises by completing the square and using a substitution to reduce it to standard form. 3. Evaluate each integral in Exercises by using trigonometric identities and substitutions to reduce it to standard form.

13 4. Evaluate each integral in Exercises by separating the fraction and using a substitution (if necessary) to reduce it to standard form. 5. Evaluate each integral in Exercises by multiplying by a form of 1 and using a substitution (if necessary) to reduce it to standard form. 6. Evaluate each integral in Exercises by eliminating the square root.

14 8.2 Integration by Parts In this section, we describe integration by parts and show how to apply it. Product Rule in Integral Form

15 EXAMPLE 1: Using Integration by Parts, Find.

16 EXAMPLE 2: Find.

17 EXAMPLE 5: Evaluate.

18 Integration by Parts Formula for Definite Integrals EXAMPLE 4:

19

20 2. 3.

21 4.

22 5.

23 Tabular Integration tabular integration is illustrated in the following examples. EXAMPLE 5 : Using Tabular Integration, Evaluate

24 EXAMPLE 6: Using Tabular Integration, Evaluate

25 EXERCISES Integration by Parts, Evaluate the integrals in Exercises 1 22.

26 8.3 Integration of Rational Functions by Partial Fractions This section shows how to express a rational function (a quotient of polynomials) as a sum of simpler fractions, called partial fractions, which are easily integrated. For example, the rational function (5x - 3) (x2-2x 3)can be rewritten as The method for rewriting rational functions as a sum of simpler fractions is called the method of partial fractions. In the case of the above example, it consists of finding constants A and B such that To find A and B, we first clear Equation (1) of fractions, obtaining

27 To integrate the rational function, General Description of the Method: Success in writing a rational function ƒ(x) g(x) as a sum of partial fractions depends on two things: The degree of ƒ(x) must be less than the degree of g(x). We must know the factors of g(x). Here is how we find the partial fractions of a proper fraction ƒ(x) g(x) when the factors of g are known.

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29 EXAMPLE 1: Evaluate, using partial fractions. Solution : The partial fraction decomposition has the form To find the values of the undetermined coefficients A, B, and C we clear fractions and get So we equate coefficients of like powers of x obtaining

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31 EXAMPLE 2: Evaluate, Solution: First we express the integrand as a sum of partial fractions with undetermined coefficients. Equating coefficients of corresponding powers of x gives

32 EXAMPLE 3: Integrating an Improper Fraction, Evaluate Solution : First we divide the denominator into the numerator to get a polynomial plus a proper fraction.

33 Then we write the improper fraction as a polynomial plus a proper fraction. We found the partial fraction decomposition of the fraction on the right in the opening example, so

34 EXAMPLE 4: Integrating with an Irreducible Quadratic Factor in the Denominator, Evaluate using partial fractions. Solution: The denominator has an irreducible quadratic factor as well as a repeated linear factor, so we write Clearing the equation of fractions gives Equating coefficients of like terms gives Dr. Mohammed Ramidh

35 We solve these equations simultaneously to find the values of A, B, C, and D: We substitute these values into Equation (2), obtaining

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37 1.

38 2.

39 3.

40 4.

41 5.

42 6.

43 EXERCISES Expand the quotients in Exercises 1 8 by partial fractions. 2. In Exercises 9 14, express the integrands as a sum of partial fractions and evaluate the integrals.

44 8.4 Trigonometric Integrals Trigonometric integrals involve algebraic combinations of the six basic trigonometric functions. 1. Products of Powers of Sines and Cosines We begin with integrals of the form:

45 EXAMPLE 1: m is Odd, Evaluate

46

47

48 Integrals of Powers of tan x and sec x

49 2. Products of Sines and Cosines

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51

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53

54

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56 EXERCISES Products of Powers of Sines and Cosines, Evaluate the integrals in Exercises

57 2. Products of Sines and Cosines,Evaluate the integrals in Exercises 33 38

Assignment. Disguises with Trig Identities. Review Product Rule. Integration by Parts. Manipulating the Product Rule. Integration by Parts 12/13/2010

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