Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos² (38°) - sin² (38° ) = cos(A° ) then degrees (b) If cos² (4x) - sin² (4x) - sin²(4x) = cos(Bº) then A B = =
Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos² (38°) - sin² (38° ) = cos(A° ) then degrees (b) If cos² (4x) - sin² (4x) - sin²(4x) = cos(Bº) then A B = =
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 16E
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Question
![Using a double-angle or half-angle formula to simplify the given expressions.
(a) If cos² (38°) - sin² (38° ) = cos(A° ) then
degrees
(b) If cos² (4x) - sin² (4x)
- sin²(4x) = cos(Bº) then
A
B
=
=](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe2cf551a-dba3-41d8-a128-901df1ea49ff%2F7b92661b-6e4f-47f0-a24f-9f5203e9a145%2Fynxjaru_processed.png&w=3840&q=75)
Transcribed Image Text:Using a double-angle or half-angle formula to simplify the given expressions.
(a) If cos² (38°) - sin² (38° ) = cos(A° ) then
degrees
(b) If cos² (4x) - sin² (4x)
- sin²(4x) = cos(Bº) then
A
B
=
=
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