Domanda del libro di testo
In Exercises 59–86, find the derivative of y with respect to the given independent variable.
71. y = log₂(5θ)
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Ch. 7 - Transcendental Functions
Hass15th EditionThomas' CalculusISBN: 9780137616077
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TOC.tableOfContents
- Ch. 1 - Functions155
- Ch. 2 - Limits and Continuity240
- Ch. 3 - Derivatives337
- Ch. 4 - Applications of Derivatives293
- Ch. 5 - Integrals41
- Ch. 6 - Applications of Definite Integrals25
- Ch. 7 - Transcendental Functions490
- Ch. 8 - Techniques of Integration399
- Ch. 9 - First-Order Differential Equations66
- Ch. 10 - Infinite Sequences and Series132
- Ch. 11 - Parametric Equations and Polar Coordinates58
Capitolo 7, Problema 7.3.49
Evaluate the integrals in Exercises 33–54.
49. ∫ e^(sec πt) sec πt tan πt dt
Guida verificata passo dopo passo1
Identify the integral to solve: \(\int e^{\sec(\pi t)} \sec(\pi t) \tan(\pi t) \, dt\).
Recognize that the integrand contains the function \(e^{\sec(\pi t)}\) multiplied by the derivative of \(\sec(\pi t)\), since the derivative of \(\sec(x)\) is \(\sec(x) \tan(x)\).
Use substitution by letting \(u = \sec(\pi t)\). Then, compute \(du\): since \(\frac{d}{dt} \sec(\pi t) = \pi \sec(\pi t) \tan(\pi t)\), it follows that \(du = \pi \sec(\pi t) \tan(\pi t) \, dt\).
Rewrite the integral in terms of \(u\) and \(du\): solve for \(dt\) in terms of \(du\) and substitute back into the integral to express it fully in terms of \(u\).
Integrate the resulting expression with respect to \(u\), then substitute back \(u = \sec(\pi t)\) to express the answer in terms of \(t\).
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Integration by Substitution
Integration by substitution is a method used to simplify integrals by changing variables. It involves identifying a part of the integrand as a new variable, differentiating it, and rewriting the integral in terms of this variable. This technique is especially useful when the integral contains a function and its derivative.
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Substitution With an Extra Variable
Derivatives of Trigonometric Functions
Understanding the derivatives of trigonometric functions like secant and tangent is crucial. For example, the derivative of sec(x) is sec(x)tan(x), which often appears in integrals involving these functions. Recognizing these derivatives helps in identifying substitution candidates.
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06:35Derivatives of Other Inverse Trigonometric Functions
Exponential Functions with Composite Arguments
Exponential functions with composite arguments, such as e^(sec(πt)), require careful handling during integration. The chain rule applies when differentiating or integrating these functions, and recognizing the inner function and its derivative is key to simplifying the integral.
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6:13Exponential Functions
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