86. (a) 2 sin 74° sin 24° (b) 8 sin 18x cos 13x

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter5: Trigonometric Functions: Right Triangle Approach
Section5.CR: Chapter Review
Problem 65E
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i would like an example on how to do question 86

Product-to-Sum and Sum-to-Product Identities
Exercises 85-88: Write each expression as a sum or difference
of trigonometric functions.
85. (a) cos 50° sin 20⁰
86. (a) 2 sin 74° sin 24°
87. (a) sin 70 cos 30
88. (a) 2 cos 5x cos 7x
(b) cos 2x cos x
(b) 8 sin 18x cos 13x
(b) sin 8x sin 4x
(b) 4 cos 90 sin 20
Transcribed Image Text:Product-to-Sum and Sum-to-Product Identities Exercises 85-88: Write each expression as a sum or difference of trigonometric functions. 85. (a) cos 50° sin 20⁰ 86. (a) 2 sin 74° sin 24° 87. (a) sin 70 cos 30 88. (a) 2 cos 5x cos 7x (b) cos 2x cos x (b) 8 sin 18x cos 13x (b) sin 8x sin 4x (b) 4 cos 90 sin 20
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