Ch. 8 - Techniques of Integration

Hass15th EditionThomas' CalculusISBN: 9780137616077Non è quello che usi tu?Cambia libro di testo

Hass 15th Edition

Ch. 8 - Techniques of Integration

Problema 8.AAE.40

Capitolo 8, Problema 8.AAE.40

Use the substitutions in Equations (1)–(4) to evaluate the integrals in Exercises 33–40. Integrals like these arise in calculating the average angular velocity of the output shaft of a universal joint when the input and output shafts are not aligned.
∫ cos t dt / (1 - cos t)

Guida verificata passo dopo passo

Recognize that the integral involves a trigonometric function in the numerator and a denominator with a difference involving cosine, which suggests using a trigonometric identity or substitution to simplify the expression.

Recall the substitution from the Weierstrass substitution or use the half-angle identity: let \(u = \tan\left(\frac{t}{2}\right)\), which transforms trigonometric functions into rational functions of \(u\).

Express \(\cos t\) and \(dt\) in terms of \(u\): use the identities \(\cos t = \frac{1 - u^2}{1 + u^2}\) and \(dt = \frac{2}{1 + u^2} du\).

Rewrite the integral \(\int \frac{\cos t}{1 - \cos t} dt\) entirely in terms of \(u\) by substituting the expressions for \(\cos t\) and \(dt\), simplifying the resulting rational function.

Integrate the resulting rational function with respect to \(u\), then substitute back \(u = \tan\left(\frac{t}{2}\right)\) to express the answer in terms of \(t\).

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Trigonometric Substitution

Trigonometric substitution involves replacing trigonometric expressions with equivalent forms to simplify integrals. For example, using identities like 1 - cos t = 2 sin²(t/2) can transform the integral into a more manageable form. This technique is essential for integrals involving trigonometric functions in the denominator.

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Introduction to Trigonometric Functions

Trigonometric Identities

Trigonometric identities are equations involving trigonometric functions that hold true for all values in their domains. Identities such as the Pythagorean identity and half-angle formulas help rewrite integrals into simpler expressions, enabling easier integration. Recognizing and applying these identities is crucial for solving integrals with trigonometric terms.

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Integration of Rational Trigonometric Functions

Integrating rational functions involving trigonometric expressions often requires algebraic manipulation and substitution. Techniques include rewriting the integrand using identities, partial fraction decomposition, or substitution to convert the integral into a standard form. Mastery of these methods allows evaluation of complex integrals like ∫ cos t / (1 - cos t) dt.

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