Find f'(x) if f(x) = e3X sin 2x

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...
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### Calculus: Finding the Derivative

**Problem Statement:**

Find \( f'(x) \) if \( f(x) = e^{3x} \sin 2x \).

**Explanation:**

To find the derivative \( f'(x) \) of the given function \( f(x) = e^{3x} \sin 2x \), we need to use the product rule. The product rule states that if \( f(x) = u(x)v(x) \), then

\[
f'(x) = u'(x)v(x) + u(x)v'(x)
\]

In this case, let:
- \( u(x) = e^{3x} \)
- \( v(x) = \sin 2x \)

We first find the derivatives \( u'(x) \) and \( v'(x) \):

1. \( u(x) = e^{3x} \):
   \[
   u'(x) = 3e^{3x} \quad \text{(using the chain rule)}
   \]

2. \( v(x) = \sin 2x \):
   \[
   v'(x) = 2\cos 2x \quad \text{(using the chain rule)}
   \]

Now we apply the product rule:

\[
f'(x) = u'(x) v(x) + u(x) v'(x)
\]

Substituting the values:

\[
f'(x) = (3e^{3x}) (\sin 2x) + (e^{3x}) (2\cos 2x)
\]

Simplifying:

\[
f'(x) = 3e^{3x} \sin 2x + 2e^{3x} \cos 2x
\]

Therefore, the derivative \( f'(x) \) is:

\[
f'(x) = 3e^{3x} \sin 2x + 2e^{3x} \cos 2x
\]

This is the required derivative of the given function \( f(x) \).
Transcribed Image Text:### Calculus: Finding the Derivative **Problem Statement:** Find \( f'(x) \) if \( f(x) = e^{3x} \sin 2x \). **Explanation:** To find the derivative \( f'(x) \) of the given function \( f(x) = e^{3x} \sin 2x \), we need to use the product rule. The product rule states that if \( f(x) = u(x)v(x) \), then \[ f'(x) = u'(x)v(x) + u(x)v'(x) \] In this case, let: - \( u(x) = e^{3x} \) - \( v(x) = \sin 2x \) We first find the derivatives \( u'(x) \) and \( v'(x) \): 1. \( u(x) = e^{3x} \): \[ u'(x) = 3e^{3x} \quad \text{(using the chain rule)} \] 2. \( v(x) = \sin 2x \): \[ v'(x) = 2\cos 2x \quad \text{(using the chain rule)} \] Now we apply the product rule: \[ f'(x) = u'(x) v(x) + u(x) v'(x) \] Substituting the values: \[ f'(x) = (3e^{3x}) (\sin 2x) + (e^{3x}) (2\cos 2x) \] Simplifying: \[ f'(x) = 3e^{3x} \sin 2x + 2e^{3x} \cos 2x \] Therefore, the derivative \( f'(x) \) is: \[ f'(x) = 3e^{3x} \sin 2x + 2e^{3x} \cos 2x \] This is the required derivative of the given function \( f(x) \).
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