Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 5 - Review Exercises - Page 248: 21


$$\cos35^\circ=\cos(-35^\circ)$$ 21 goes with G.

Work Step by Step

$$\cos35^\circ$$ Recall the negative-angle identities for cosines: $$\cos(-\theta)=\cos\theta$$ Therefore, we can rewrite $\cos35^\circ$ as follows: $$\cos35^\circ=\cos(-35^\circ)$$ Hence, we see that 21 is matched with G.
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