Evaluate the integrals in Exercises 67–74 in terms of
b. natural logarithms.
67. ∫(from 0 to 2√3)dx/√(4+x²)

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Recognize that the integral is of the form \(\int \frac{dx}{\sqrt{a^2 + x^2}}\), where \(a = 2\) in this case.

Recall the standard integral formula: \(\int \frac{dx}{\sqrt{a^2 + x^2}} = \ln \left| x + \sqrt{x^2 + a^2} \right| + C\).

Apply the definite integral limits from \(0\) to \(2\sqrt{3}\), so write the expression as \(\left[ \ln \left( x + \sqrt{x^2 + 4} \right) \right]_0^{2\sqrt{3}}\).

Evaluate the expression at the upper limit \(x = 2\sqrt{3}\) and at the lower limit \(x = 0\) separately.

Subtract the value at the lower limit from the value at the upper limit to get the final answer in terms of natural logarithms.

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주요 개념

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Definite Integrals

A definite integral calculates the net area under a curve between two specific limits. It involves evaluating the antiderivative at the upper and lower bounds and subtracting these values to find the exact accumulated quantity.

Integration of Functions Involving √(a² + x²)

Integrals of the form ∫dx/√(a² + x²) often use trigonometric substitution or recognize standard integral formulas. The antiderivative typically involves inverse hyperbolic functions or natural logarithms, such as ln|x + √(x² + a²)|.

Natural Logarithms in Integration

Natural logarithms frequently appear in integrals involving rational functions and roots. They provide a way to express antiderivatives of functions like 1/√(a² + x²), linking algebraic expressions to logarithmic forms for easier evaluation.

Evaluate the integrals in Exercises 67–74 in terms ofb. natural logarithms.67. ∫(from 0 to 2√3)dx/√(4+x²)