Bonus: Let the exact value of sin(80°) = a. Find an exact value for cos(20°) in terms of a. Your answer should not contain any decimals. cos(20°) =
Bonus: Let the exact value of sin(80°) = a. Find an exact value for cos(20°) in terms of a. Your answer should not contain any decimals. cos(20°) =
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°.
Related questions
Question
![**Bonus Problem:**
Let the exact value of \(\sin(80^\circ) = a\). Find an exact value for \(\cos(20^\circ)\) in terms of \(a\). Your answer should not contain any decimals.
\[
\cos(20^\circ) = \,
\]
*[Input box for answer]*](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F53dc3663-7fd1-433e-97d7-8ab208c305a6%2F75b4f1e6-49a1-4ae0-b16c-336b977b9f4e%2F25n95gc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Bonus Problem:**
Let the exact value of \(\sin(80^\circ) = a\). Find an exact value for \(\cos(20^\circ)\) in terms of \(a\). Your answer should not contain any decimals.
\[
\cos(20^\circ) = \,
\]
*[Input box for answer]*
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