Use an addition or subtraction formula to write the expression as a trigonometric function of one number: 3π 2π 2π COS 7 21 21 COS A B = = + sin 3π 7 - sin = COS π A = B 2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 13E
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Use an addition or subtraction formula to write the expression as a
trigonometric function of one number:
3π 2π
2π
COS
7
21
21
COS
A
B
=
=
+ sin
3π
7
- sin
= COS
π
A
=
B
2
Transcribed Image Text:Use an addition or subtraction formula to write the expression as a trigonometric function of one number: 3π 2π 2π COS 7 21 21 COS A B = = + sin 3π 7 - sin = COS π A = B 2
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