78. sin² 20 1 + cos 20 = 2 sin²0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 19E
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can you explain how to verify this identity

78.
sin² 20
1 + cos 20
2 sin²0
Transcribed Image Text:78. sin² 20 1 + cos 20 2 sin²0
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