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Ch. 7 - Logarithmic, Exponential Functions, and Hyperbolic Functions
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Non è quello che usi tu?Cambia libro di testo
Capitolo 7, Problema 7.3.79d

Evaluating hyperbolic functions Evaluate each expression without using a calculator or state that the value does not exist. Simplify answers as much as possible.


d. sech (sinh 0)

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Recall the definitions of the hyperbolic functions involved: \( \sinh x = \frac{e^{x} - e^{-x}}{2} \) and \( \sech x = \frac{1}{\cosh x} \), where \( \cosh x = \frac{e^{x} + e^{-x}}{2} \).
First, evaluate \( \sinh 0 \) by substituting \( x = 0 \) into the definition: \( \sinh 0 = \frac{e^{0} - e^{0}}{2} \).
Simplify the expression for \( \sinh 0 \) to find its exact value.
Next, substitute the value of \( \sinh 0 \) into the expression \( \sech(\sinh 0) \), which becomes \( \sech(\text{value}) = \frac{1}{\cosh(\text{value})} \).
Finally, evaluate \( \cosh(\text{value}) \) using its definition and simplify to find \( \sech(\sinh 0) \).

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Hyperbolic Sine Function (sinh)

The hyperbolic sine function, sinh(x), is defined as (e^x - e^(-x))/2. It is an odd function and maps real numbers to real numbers. Evaluating sinh at zero gives sinh(0) = 0, which is a key step in simplifying expressions involving hyperbolic functions.
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Graph of Sine and Cosine Function

Hyperbolic Secant Function (sech)

The hyperbolic secant function, sech(x), is defined as 1/cosh(x), where cosh(x) = (e^x + e^(-x))/2. It is always positive for real x and is used to find the reciprocal of the hyperbolic cosine. Understanding sech helps in evaluating expressions like sech(sinh 0).
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Graphs of Secant and Cosecant Functions

Function Composition and Simplification

Function composition involves applying one function to the result of another, such as sech(sinh 0). Simplifying requires evaluating the inner function first, then applying the outer function. This stepwise approach is essential for correctly simplifying nested hyperbolic expressions.
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Evaluate Composite Functions - Special Cases
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Evaluating hyperbolic functions Evaluate each expression without using a calculator or state that the value does not exist. Simplify answers as much as possible.

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Evaluating hyperbolic functions Use a calculator to evaluate each expression or state that the value does not exist. Report answers accurate to four decimal places to the right of the decimal point.

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Terminal velocity Refer to Exercises 95 and 96.


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Explain why or why not Determine whether the following statements are true and give an explanation or counterexample.


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