Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (s − t). 1 COS S = 35 and sint = 45 s and t in quadrant I cos (s +t) = ☐ (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (s − t). 1 COS S = 35 and sint = 45 s and t in quadrant I cos (s +t) = ☐ (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 19E
Question
![Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (s − t).
1
COS S =
35
and sint =
45
s and t in quadrant I
cos (s +t) = ☐
(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3ea3400e-20ab-4705-aa5d-320dc8f61f02%2F7678b01d-6aee-4200-af10-94306cc93c83%2Fopk8fqb_processed.png&w=3840&q=75)
Transcribed Image Text:Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (s − t).
1
COS S =
35
and sint =
45
s and t in quadrant I
cos (s +t) = ☐
(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
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