Let f(x) = e cosx, sx %3D 2. Express your answers in exact form. ElN

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
icon
Related questions
Topic Video
Question
**(d) Determine the inflection points.**

In mathematical terms, an inflection point is a point on a curve at which the curve changes concavity, which means it goes from being concave (curving upward) to convex (curving downward), or vice versa. To find the inflection points of a function, one typically needs to find where the second derivative of the function changes sign. 

**Example Calculation:**

1. Given a function \( f(x) \), first, find its first derivative \( f'(x) \).
2. Next, find the second derivative \( f''(x) \).
3. Solve the equation \( f''(x) = 0 \) to find potential inflection points.
4. Verify if the sign of \( f''(x) \) changes around those points.

**Graph Explanation:**

If a graph were provided, we would look for points where the curve changes its direction of curvature. These points indicate where the function switches from a "bowl-shaped" upward curve to a "cap-shaped" downward curve (or vice versa), confirming the presence of an inflection point.
Transcribed Image Text:**(d) Determine the inflection points.** In mathematical terms, an inflection point is a point on a curve at which the curve changes concavity, which means it goes from being concave (curving upward) to convex (curving downward), or vice versa. To find the inflection points of a function, one typically needs to find where the second derivative of the function changes sign. **Example Calculation:** 1. Given a function \( f(x) \), first, find its first derivative \( f'(x) \). 2. Next, find the second derivative \( f''(x) \). 3. Solve the equation \( f''(x) = 0 \) to find potential inflection points. 4. Verify if the sign of \( f''(x) \) changes around those points. **Graph Explanation:** If a graph were provided, we would look for points where the curve changes its direction of curvature. These points indicate where the function switches from a "bowl-shaped" upward curve to a "cap-shaped" downward curve (or vice versa), confirming the presence of an inflection point.
### Function Analysis and Domain

Consider the function \( f(x) = e^{-x} \cos(x) \), with the domain \(-\frac{\pi}{2} \leq x \leq \frac{\pi}{2} \).

**Instructions:**
- Provide answers in exact form.

### Explanation:

- **Function**: The function \( f(x) \) is defined as the product of an exponential function and a trigonometric function:
  \[
  f(x) = e^{-x} \cos(x)
  \]
- **Domain**: The function is considered in the interval:
  \[
  -\frac{\pi}{2} \leq x \leq \frac{\pi}{2}
  \]
- **Guideline**: Ensure that all answers derived from the function and within its domain should be expressed in exact form without numerical approximations.

This function combines exponential decay and oscillatory behavior, offering a complex example to study within the specified interval. The exponential part \(e^{-x}\) ensures that the function decreases as \(x\) increases, whereas the cosine part \(\cos(x)\) introduces cyclical variations. The interplay between these two types of functions can be explored in various mathematical contexts.
Transcribed Image Text:### Function Analysis and Domain Consider the function \( f(x) = e^{-x} \cos(x) \), with the domain \(-\frac{\pi}{2} \leq x \leq \frac{\pi}{2} \). **Instructions:** - Provide answers in exact form. ### Explanation: - **Function**: The function \( f(x) \) is defined as the product of an exponential function and a trigonometric function: \[ f(x) = e^{-x} \cos(x) \] - **Domain**: The function is considered in the interval: \[ -\frac{\pi}{2} \leq x \leq \frac{\pi}{2} \] - **Guideline**: Ensure that all answers derived from the function and within its domain should be expressed in exact form without numerical approximations. This function combines exponential decay and oscillatory behavior, offering a complex example to study within the specified interval. The exponential part \(e^{-x}\) ensures that the function decreases as \(x\) increases, whereas the cosine part \(\cos(x)\) introduces cyclical variations. The interplay between these two types of functions can be explored in various mathematical contexts.
Expert Solution
steps

Step by step

Solved in 2 steps with 1 images

Blurred answer
Knowledge Booster
Chain Rule
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, calculus and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Calculus: Early Transcendentals
Calculus: Early Transcendentals
Calculus
ISBN:
9781285741550
Author:
James Stewart
Publisher:
Cengage Learning
Thomas' Calculus (14th Edition)
Thomas' Calculus (14th Edition)
Calculus
ISBN:
9780134438986
Author:
Joel R. Hass, Christopher E. Heil, Maurice D. Weir
Publisher:
PEARSON
Calculus: Early Transcendentals (3rd Edition)
Calculus: Early Transcendentals (3rd Edition)
Calculus
ISBN:
9780134763644
Author:
William L. Briggs, Lyle Cochran, Bernard Gillett, Eric Schulz
Publisher:
PEARSON
Calculus: Early Transcendentals
Calculus: Early Transcendentals
Calculus
ISBN:
9781319050740
Author:
Jon Rogawski, Colin Adams, Robert Franzosa
Publisher:
W. H. Freeman
Precalculus
Precalculus
Calculus
ISBN:
9780135189405
Author:
Michael Sullivan
Publisher:
PEARSON
Calculus: Early Transcendental Functions
Calculus: Early Transcendental Functions
Calculus
ISBN:
9781337552516
Author:
Ron Larson, Bruce H. Edwards
Publisher:
Cengage Learning