Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 5 - Test - Page 244: 5a


$cos(270^{\circ}-x) = - sin~x$

Work Step by Step

$cos(270^{\circ}-x)$ $=cos(270^{\circ})~cos(x)+sin(270^{\circ})~sin(x)$ $=(0)~cos(x)+(-1)~sin(x)$ $= - sin~x$
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