Algebra and Trigonometry 10th Edition

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

Answer

$\ln(cos^2t)+\ln(1+tan^2t)=0$

Work Step by Step

$\ln(cos^2t)+\ln(1+tan^2t)=\ln(cos^2t)+\ln(sec^2t)=\ln(cos^2t~sec^2t)=\ln(cos^2t~\frac{1}{cos^2t})=\ln1=0$
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