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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
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
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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.)
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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