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 513: 42



Work Step by Step

Remember that: $csc^2x=cot^2x+1$ $csc^2x-1=cot^2x$ $(2~csc~x+2)(2~csc~x-2)=(2~csc~x)^2-2^2=4~csc^2x-4=4(csc^2x-1)=4~cot^2x$
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