7–40. Table look-up integrals Use a table of integrals to evaluate the following indefinite integrals. Some of the integrals require preliminary work, such as completing the square or changing variables, before they can be found in a table.
28. ∫ ln² x dx

검증된 단계별 안내

Step 1: Recognize that the integral ∫ ln²(x) dx involves a logarithmic function squared. To solve this, we can use a table of integrals that provides a formula for ∫ ln²(x) dx.

Step 2: Recall the formula from the table of integrals: ∫ ln²(x) dx = x * ln²(x) - 2x * ln(x) + 2x + C, where C is the constant of integration.

Step 3: Verify that the formula matches the structure of the given integral. If necessary, confirm the derivation of the formula using integration by parts.

Step 4: Substitute the formula directly into the integral, ensuring that all terms are expressed in terms of x.

Step 5: Simplify the expression obtained from the formula, and include the constant of integration (C) to represent the indefinite integral.

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주요 개념

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Indefinite Integrals

Indefinite integrals represent a family of functions whose derivative is the integrand. They are expressed with the integral sign and do not have specified limits. The result includes a constant of integration, denoted as 'C', reflecting the fact that there are infinitely many antiderivatives differing by a constant.

Integration Techniques

Various techniques are employed to evaluate integrals, especially when they cannot be solved directly. Common methods include substitution, integration by parts, and completing the square. These techniques transform the integral into a more manageable form, allowing for easier application of integral tables or direct integration.

Integral Tables

Integral tables are collections of pre-calculated integrals that provide quick references for evaluating common integrals. They list integrals alongside their corresponding results, often requiring the user to manipulate the integrand into a suitable form. Familiarity with these tables can significantly expedite the integration process, especially for complex functions.

7–40. Table look-up integrals Use a table of integrals to evaluate the following indefinite integrals. Some of the integrals require preliminary work, such as completing the square or changing variables, before they can be found in a table.28. ∫ ln² x dx