Find sin 2x, cos 2x, and tan 2x if tanx= and x terminates in quadrant II. 12

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
Topic Video
Question
**Title: Solving Double-Angle Trigonometric Functions**

**Problem Statement:**
Find \( \sin 2x \), \( \cos 2x \), and \( \tan 2x \) if \( \tan x = -\frac{5}{12} \) and \( x \) terminates in quadrant II.

**Required Calculations:**

1. **For \( \sin 2x \):**
   \[
   \sin 2x = \Box
   \]

2. **For \( \cos 2x \):**
   \[
   \cos 2x = \Box
   \]

3. **For \( \tan 2x \):**
   \[
   \tan 2x = \Box
   \]

**Instructions:**

Given that \( \tan x = -\frac{5}{12} \) in quadrant II, recall the trigonometric identities and relationships between the functions to solve for \( \sin 2x \), \( \cos 2x \), and \( \tan 2x \). 

- Use the double-angle identity for sine: 
  \[
  \sin 2x = 2 \sin x \cos x
  \]

- Use the double-angle identity for cosine:
  \[
  \cos 2x = \cos^2 x - \sin^2 x
  \]
  or
  \[
  \cos 2x = 2 \cos^2 x - 1
  \]
  or
  \[
  \cos 2x = 1 - 2 \sin^2 x
  \]

- Use the double-angle identity for tangent:
  \[
  \tan 2x = \frac{2 \tan x}{1 - \tan^2 x}
  \]

First, determine \( \sin x \) and \( \cos x \) using the Pythagorean identity:
\[
\tan x = \frac{\sin x}{\cos x}
\]
Given that \( \tan x = -\frac{5}{12} \) and knowing that sine is positive and cosine is negative in quadrant II, you can find \( \sin x \) and \( \cos x \) before applying the double-angle formulas.

**Graphical Representation:**
On the right side of the problem, there's a
Transcribed Image Text:**Title: Solving Double-Angle Trigonometric Functions** **Problem Statement:** Find \( \sin 2x \), \( \cos 2x \), and \( \tan 2x \) if \( \tan x = -\frac{5}{12} \) and \( x \) terminates in quadrant II. **Required Calculations:** 1. **For \( \sin 2x \):** \[ \sin 2x = \Box \] 2. **For \( \cos 2x \):** \[ \cos 2x = \Box \] 3. **For \( \tan 2x \):** \[ \tan 2x = \Box \] **Instructions:** Given that \( \tan x = -\frac{5}{12} \) in quadrant II, recall the trigonometric identities and relationships between the functions to solve for \( \sin 2x \), \( \cos 2x \), and \( \tan 2x \). - Use the double-angle identity for sine: \[ \sin 2x = 2 \sin x \cos x \] - Use the double-angle identity for cosine: \[ \cos 2x = \cos^2 x - \sin^2 x \] or \[ \cos 2x = 2 \cos^2 x - 1 \] or \[ \cos 2x = 1 - 2 \sin^2 x \] - Use the double-angle identity for tangent: \[ \tan 2x = \frac{2 \tan x}{1 - \tan^2 x} \] First, determine \( \sin x \) and \( \cos x \) using the Pythagorean identity: \[ \tan x = \frac{\sin x}{\cos x} \] Given that \( \tan x = -\frac{5}{12} \) and knowing that sine is positive and cosine is negative in quadrant II, you can find \( \sin x \) and \( \cos x \) before applying the double-angle formulas. **Graphical Representation:** On the right side of the problem, there's a
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