Which of the following is NOT an identity for cos(20)? O cos²x - sin² x O2 sin² x - 1 2 cos² x 1 -

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°.
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Which of the following is NOT an
identity for cos(20)?
cos²x - sin² x
O2 sin² x - 1
2 cos²x - 1
Transcribed Image Text:Which of the following is NOT an identity for cos(20)? cos²x - sin² x O2 sin² x - 1 2 cos²x - 1
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