Answer
$cos(270^{\circ}-x) = - sin~x$
Work Step by Step
$cos(270^{\circ}-x)$
$=cos(270^{\circ})~cos(x)+sin(270^{\circ})~sin(x)$
$=(0)~cos(x)+(-1)~sin(x)$
$= - sin~x$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 5 - Test - Page 250: 5a
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