Ch. 8 - Integration Techniques

Briggs - Calculus: Early Transcendentals 3rd Edition

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Briggs 3rd Edition

Ch. 8 - Integration Techniques

Problema 8.3.4

Capitolo 8, Problema 8.3.4

4. Describe the method used to integrate sinᵐx cosⁿx, for m even and n odd.

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Step 1: Recognize the structure of the integral. The problem involves integrating a product of sine and cosine functions, where the power of sine (m) is even and the power of cosine (n) is odd.

Step 2: Use the substitution method. Since n is odd, isolate one cosine term (cos(x)) and rewrite the remaining cosⁿx as cosⁿ⁻¹x. This allows you to use the identity cos²x = 1 - sin²x to express the integral in terms of sine.

Step 3: Rewrite the integral. Substitute cos²x = 1 - sin²x into the expression, and replace cos(x) dx with du, where u = sin(x). This substitution simplifies the integral into a polynomial in terms of u.

Step 4: Perform the integration. Integrate the resulting polynomial in terms of u using standard integration techniques.

Step 5: Back-substitute. Once the integral is solved in terms of u, replace u with sin(x) to express the solution in terms of the original variable x.

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Integration by Parts

Integration by parts is a technique derived from the product rule of differentiation. It is used to integrate products of functions and is expressed as ∫u dv = uv - ∫v du. In the context of integrating sinᵐx cosⁿx, this method can simplify the integral by choosing appropriate u and dv, particularly when one of the functions is easily integrable.

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Integration by Parts for Definite Integrals

Trigonometric Identities

Trigonometric identities are equations involving trigonometric functions that are true for all values of the variables. For integrating sinᵐx cosⁿx, identities such as sin²x + cos²x = 1 or the double angle formulas can be useful. These identities help in rewriting the integrand in a more manageable form, especially when dealing with even and odd powers.

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Verifying Trig Equations as Identities

Reduction Formulas

Reduction formulas are recursive relationships that express integrals of functions in terms of integrals of lower powers. For sinᵐx cosⁿx, reduction formulas can simplify the integration process by reducing the powers of sine and cosine step by step. This method is particularly effective when m is even and n is odd, allowing for systematic integration until reaching a solvable integral.

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Recursive Formulas

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