Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 7 - 7.4 - Sum and Difference Formulas - 7.4 Exercises - Page 540: 86


See below.

Work Step by Step

a) We see that $\sin u =\sin v =x$. It is a positive number. and $\sin (u+v)=0$ Thus, $x+x \ne 0$ so, $2x \ne 0$ We see that $\sin u =\sin v =x$, and it is a positive number. and $\sin (u-v)=-1$ Thus, $x-x \ne -1$ so, $0 \ne -1$
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