Homework Help is Here – Start Your Trial Now!
Math
Trigonometry
Establish the identity. 1-2 sin 20 cos 20-2 sin 40 = cos (20)

Establish the identity. 1-2 sin 20 cos 20-2 sin 40 = cos (20)

Trigonometry (11th Edition)
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°.
See similar textbooks
icon
Related questions
Question
Establish the identity. 1-2 sin 20 cos 20-2 sin 40 = cos (20) Choose the sequence of steps below that verifies the identity. B. OA. 1-2 sin ²0 cos 20-2 sin 40 = (cos 20+ sin ²0) (1-2 sin ²0) = 1 - cos (20) = cos (20) 1-2 sin ²0 cos ²0-2 sin 40 = (cos 20- sin ²0) (1+2 sin ²0) = = 1. cos (20) = cos (20) 1-2 sin ²0 cos 20-2 sin 40 = (cos ²0-sin ²0) (1-2 sin ²0) = 1. cos (20) = cos (20) O D. 1-2 sin ²0 cos 20-2 sin 40 = (cos ²0+ 1) (sin ²0-2 sin 20) = 1 cos (20) = cos (20) O C.
Transcribed Image Text:Establish the identity. 1-2 sin 20 cos 20-2 sin 40 = cos (20) Choose the sequence of steps below that verifies the identity. B. OA. 1-2 sin ²0 cos 20-2 sin 40 = (cos 20+ sin ²0) (1-2 sin ²0) = 1 - cos (20) = cos (20) 1-2 sin ²0 cos ²0-2 sin 40 = (cos 20- sin ²0) (1+2 sin ²0) = = 1. cos (20) = cos (20) 1-2 sin ²0 cos 20-2 sin 40 = (cos ²0-sin ²0) (1-2 sin ²0) = 1. cos (20) = cos (20) O D. 1-2 sin ²0 cos 20-2 sin 40 = (cos ²0+ 1) (sin ²0-2 sin 20) = 1 cos (20) = cos (20) O C.
Expert Solution
steps

Step by step

Solved in 3 steps with 3 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Trigonometry (11th Edition)
Trigonometry (11th Edition)
Trigonometry
ISBN:
9780134217437
Author:
Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:
PEARSON
Trigonometry (MindTap Course List)
Trigonometry (MindTap Course List)
Trigonometry
ISBN:
9781305652224
Author:
Charles P. McKeague, Mark D. Turner
Publisher:
Cengage Learning
Algebra and Trigonometry
Algebra and Trigonometry
Trigonometry
ISBN:
9781938168376
Author:
Jay Abramson
Publisher:
OpenStax
Trigonometry (MindTap Course List)
Trigonometry (MindTap Course List)
Trigonometry
ISBN:
9781337278461
Author:
Ron Larson
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS