Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (st). sin s= 5 13 and sint = - 4 s in quadrant I and t in quadrant III 5 cos (s+t)= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) cos (st) = ☐ (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 (st). sin s= 5 13 and sint = - 4 s in quadrant I and t in quadrant III 5 cos (s+t)= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) cos (st) = ☐ (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
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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Transcribed Image Text:Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (st).
sin s=
5
13
and sint =
-
4
s in quadrant I and t in quadrant III
5
cos (s+t)=
(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
cos (st) = ☐
(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
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