Ch. 8 - Integration Techniques

Briggs - Calculus: Early Transcendentals 3rd Edition

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Briggs 3rd Edition

Ch. 8 - Integration Techniques

Problema 8.6.41

Capitolo 8, Problema 8.6.41

7–84. Evaluate the following integrals.
41. ∫ cot^(3/2)x · csc⁴x dx

Guida verificata passo dopo passo

Step 1: Recognize that the integral involves trigonometric functions cot(x) and csc(x). Rewrite cot^(3/2)(x) as (cot(x))^(3/2) for clarity.

Step 2: Use trigonometric identities to simplify the expression. Recall that cot(x) = cos(x)/sin(x) and csc(x) = 1/sin(x). Substitute these identities into the integral.

Step 3: Combine the powers of sin(x) in the denominator after substitution. The integral will now involve a single trigonometric function raised to a power.

Step 4: Consider a substitution method to simplify the integral further. Let u = sin(x), which implies du = cos(x) dx. Rewrite the integral in terms of u.

Step 5: After substitution, simplify the integral in terms of u and proceed to integrate using standard power rule techniques. Once integrated, substitute back u = sin(x) to express the result in terms of x.

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Integration Techniques

Integration techniques are methods used to find the integral of a function. Common techniques include substitution, integration by parts, and trigonometric identities. Understanding these methods is crucial for evaluating complex integrals, such as those involving trigonometric functions like cotangent and cosecant.

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Trigonometric Identities

Trigonometric identities are equations that relate the angles and sides of triangles through sine, cosine, tangent, and their reciprocals. For example, the identity csc(x) = 1/sin(x) and cot(x) = cos(x)/sin(x) can simplify integrals involving these functions. Mastery of these identities is essential for transforming and simplifying integrals.

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Improper Integrals

Improper integrals are integrals that have infinite limits or integrands that approach infinity within the interval of integration. Evaluating these integrals often requires limits and careful analysis of convergence. Understanding how to handle improper integrals is important for ensuring that the integral can be computed correctly.

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59. Area of a segment of a circle

Use two approaches to show that the area of a cap (or segment) of a circle of radius r subtended by an angle θ (see figure) is given by:

A_seg = (1/2) r² (θ - sin θ)

b. Find the area using calculus.

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23-64. Integration Evaluate the following integrals.

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54. ∫(from 0 to π/2) sin⁶x dx = 5π/32

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92–98. Evaluate the following integrals.

94. ∫ (dt / (t³ + 1))

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Evaluate the following integrals.

∫ x/(x² + 6x + 18) dx

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23-64. Integration Evaluate the following integrals.