If f(x) = sin(x³), find f'(x). 3x² cos(x³) Find f'(2). ४ OF

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
Question
**Problem Statement:**

If \( f(x) = \sin(x^3) \), find \( f'(x) \).

**Solution:**

The derivative \( f'(x) \) is given as \( 3x^2 \cos(x^3) \).

**Next step:**

Find \( f'(2) \).

**Explanation:**

To find the derivative of \( f(x) = \sin(x^3) \), we use the chain rule. The chain rule states that the derivative of a composite function \( f(g(x)) \) is \( f'(g(x)) \cdot g'(x) \).

1. Let \( u = x^3 \). Then, \( f(x) = \sin(u) \) and \( f'(u) = \cos(u) \).
2. The derivative of \( u = x^3 \) with respect to \( x \) is \( u' = 3x^2 \).

Therefore, \( f'(x) = \cos(x^3) \cdot 3x^2 = 3x^2 \cos(x^3) \).

Finally, to find \( f'(2) \), substitute \( x = 2 \) into the derivative:

\[ f'(2) = 3(2)^2 \cos((2)^3) = 3 \times 4 \cos(8) = 12 \cos(8). \]

The value of \( f'(2) \) is \( 12 \cos(8) \).
Transcribed Image Text:**Problem Statement:** If \( f(x) = \sin(x^3) \), find \( f'(x) \). **Solution:** The derivative \( f'(x) \) is given as \( 3x^2 \cos(x^3) \). **Next step:** Find \( f'(2) \). **Explanation:** To find the derivative of \( f(x) = \sin(x^3) \), we use the chain rule. The chain rule states that the derivative of a composite function \( f(g(x)) \) is \( f'(g(x)) \cdot g'(x) \). 1. Let \( u = x^3 \). Then, \( f(x) = \sin(u) \) and \( f'(u) = \cos(u) \). 2. The derivative of \( u = x^3 \) with respect to \( x \) is \( u' = 3x^2 \). Therefore, \( f'(x) = \cos(x^3) \cdot 3x^2 = 3x^2 \cos(x^3) \). Finally, to find \( f'(2) \), substitute \( x = 2 \) into the derivative: \[ f'(2) = 3(2)^2 \cos((2)^3) = 3 \times 4 \cos(8) = 12 \cos(8). \] The value of \( f'(2) \) is \( 12 \cos(8) \).
Expert Solution
Step 1

Calculus homework question answer, step 1, image 1

steps

Step by step

Solved in 3 steps with 3 images

Blurred answer
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