2cosx cos2x+1 3. Prove that secx. Which double angle identity of cos2x did you use and why?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 84E
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2cosx
cos2x+1
3. Prove that
= secx. Which double
angle identity of cos2x did you use and
why?
Transcribed Image Text:2cosx cos2x+1 3. Prove that = secx. Which double angle identity of cos2x did you use and why?
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