Trigonometry (11th Edition) Clone

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

Chapter 8 - Quiz (Sections 8.1-8.4) - Page 385: 6c



Work Step by Step

We know that $\cos270^{\circ}=0$ and $\sin270^{\circ}=-1$ Substituting these values in the expression and solving: $7(\cos270^{\circ}+i\sin270^{\circ})=7(0-1i)=-7i$
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