Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 6 - Review - Test - Page 531: 4

Answer

(a) $\frac{\sqrt 2}{2}$ (b) $\frac{\sqrt 3}{3}$ (c) $2$ (d) $1$

Work Step by Step

(a) $sin(405^\circ)=sin(360^\circ+45^\circ)=sin(45^\circ)=\frac{\sqrt 2}{2}$ (b) $tan(-150^\circ)=tan(180^\circ-150^\circ)=tan30^\circ=\frac{\sqrt 3}{3}$ (c) $sec\frac{5\pi}{3}=sec\frac{6\pi-\pi}{3}=sec\frac{\pi}{3}=2$ (d) $csc\frac{5\pi}{2}=csc\frac{4\pi+\pi}{2}=csc\frac{\pi}{2}=1$
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