Answer
$\ln(cos^2t)+\ln(1+tan^2t)=0$
Work Step by Step
$\ln(cos^2t)+\ln(1+tan^2t)=\ln(cos^2t)+\ln(sec^2t)=\ln(cos^2t~sec^2t)=\ln(cos^2t~\frac{1}{cos^2t})=\ln1=0$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.1 - Using Fundamental Identities - 7.1 Exercises - Page 514: 64
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