If x= ln (sec θ +tan θ) , show that sec θ = cosh x .

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter1: The Six Trigonometric Functions
Section1.3: Definition I: Trigonometric Functions
Problem 41PS: As increases from 0 to 90, the value of tan tends toward ___________.
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If x= ln (sec θ +tan θ) , show that sec θ = cosh x .

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