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Ch. 8 - Techniques of Integration
Hass - Thomas' Calculus 15th Edition
Hass15th EditionThomas' CalculusISBN: 9780137616077Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoHass 15th EditionCh. 8 - Techniques of IntegrationProblema 8.7.18a
Capitolo 8, Problema 8.7.18a

In Exercises 11–22, estimate the minimum number of subintervals needed to approximate the integrals with an error of magnitude less than 10^-4 by (a) the Trapezoidal Rule (The integrals in Exercises 11–18 are the integrals from Exercises 1–8.)
∫ from 2 to 4 of 1/(s - 1)² ds

Guida verificata passo dopo passo
1
Identify the function to be integrated: \(f(s) = \frac{1}{(s - 1)^2}\) over the interval \([2, 4]\).
Recall the error bound formula for the Trapezoidal Rule: \(|E_T| \leq \frac{(b - a)^3}{12 n^2} \max_{a \leq x \leq b} |f''(x)|\), where \(n\) is the number of subintervals.
Compute the first derivative \(f'(s)\) and then the second derivative \(f''(s)\) of the function \(f(s)\).
Determine the maximum absolute value of \(f''(s)\) on the interval \([2, 4]\) by analyzing \(f''(s)\) or evaluating it at critical points and endpoints.
Set the error bound \(\frac{(4 - 2)^3}{12 n^2} \max |f''(s)| < 10^{-4}\) and solve this inequality for \(n\) to find the minimum number of subintervals needed.

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Trapezoidal Rule

The Trapezoidal Rule is a numerical method to approximate definite integrals by dividing the interval into subintervals and approximating the area under the curve as trapezoids. The accuracy depends on the number of subintervals; more subintervals generally yield better approximations.
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Power Rules

Error Bound for the Trapezoidal Rule

The error bound for the Trapezoidal Rule estimates the maximum possible error in the approximation. It depends on the second derivative of the function, the length of the interval, and the number of subintervals. Specifically, the error is bounded by (b−a)³/(12n²) times the maximum of |f''(x)| on [a,b].
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Percorso guidato
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Determining Error and Relative Error

Second Derivative and Its Role in Error Estimation

The second derivative of the integrand measures the concavity of the function and influences the error in the Trapezoidal Rule. To estimate the error bound, one must find the maximum absolute value of the second derivative on the interval, which helps determine how many subintervals are needed for a desired accuracy.
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The Second Derivative Test: Finding Local Extrema
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In Exercises 11–22, estimate the minimum number of subintervals needed to approximate the integrals with an error of magnitude less than 10^-4 by (a) the Trapezoidal Rule (The integrals in Exercises 11–18 are the integrals from Exercises 1–8.)

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In Exercises 11–22, estimate the minimum number of subintervals needed to approximate the integrals with an error of magnitude less than 10^-4 by (a) the Trapezoidal Rule (The integrals in Exercises 11–18 are the integrals from Exercises 1–8.)

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