prove thatn f(x)=In(cosx), then f1(x)=-tanx

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 54E
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prove thatn f(x)=In(cosx), then f1(x)=-tanx

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