#### Answer

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

#### Work Step by Step

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

Published by
Pearson

ISBN 10:
0321671775

ISBN 13:
978-0-32167-177-6

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

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