cos 0 = 6100 9' tan Ꮎ < 0 Find sin 0.

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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Given the mathematical problem:

\[
\cos \theta = \frac{8}{9}, \quad \tan \theta < 0
\]

**Objective:** Find \(\sin \theta\).

**Explanation:**

1. **Identify the Quadrant:**
   - Since \(\cos \theta\) is positive and \(\tan \theta\) is negative, \(\theta\) must be in the fourth quadrant.

2. **Use the Pythagorean Identity:**
   \[
   \sin^2 \theta + \cos^2 \theta = 1
   \]
   Substitute \(\cos \theta = \frac{8}{9}\):
   \[
   \sin^2 \theta + \left(\frac{8}{9}\right)^2 = 1
   \]
   \[
   \sin^2 \theta + \frac{64}{81} = 1
   \]
   \[
   \sin^2 \theta = 1 - \frac{64}{81}
   \]
   \[
   \sin^2 \theta = \frac{81}{81} - \frac{64}{81}
   \]
   \[
   \sin^2 \theta = \frac{17}{81}
   \]

3. **Calculate \(\sin \theta\):**
   Since \(\theta\) is in the fourth quadrant, \(\sin \theta\) is negative:
   \[
   \sin \theta = -\sqrt{\frac{17}{81}}
   \]
   \[
   \sin \theta = -\frac{\sqrt{17}}{9}
   \]

Therefore, \(\sin \theta = -\frac{\sqrt{17}}{9}\).
Transcribed Image Text:Given the mathematical problem: \[ \cos \theta = \frac{8}{9}, \quad \tan \theta < 0 \] **Objective:** Find \(\sin \theta\). **Explanation:** 1. **Identify the Quadrant:** - Since \(\cos \theta\) is positive and \(\tan \theta\) is negative, \(\theta\) must be in the fourth quadrant. 2. **Use the Pythagorean Identity:** \[ \sin^2 \theta + \cos^2 \theta = 1 \] Substitute \(\cos \theta = \frac{8}{9}\): \[ \sin^2 \theta + \left(\frac{8}{9}\right)^2 = 1 \] \[ \sin^2 \theta + \frac{64}{81} = 1 \] \[ \sin^2 \theta = 1 - \frac{64}{81} \] \[ \sin^2 \theta = \frac{81}{81} - \frac{64}{81} \] \[ \sin^2 \theta = \frac{17}{81} \] 3. **Calculate \(\sin \theta\):** Since \(\theta\) is in the fourth quadrant, \(\sin \theta\) is negative: \[ \sin \theta = -\sqrt{\frac{17}{81}} \] \[ \sin \theta = -\frac{\sqrt{17}}{9} \] Therefore, \(\sin \theta = -\frac{\sqrt{17}}{9}\).
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