Answer
$-30^{o}\not\in[0^{o},360)$
Work Step by Step
Solving the equation over the given interval
we expect the solution(s) to belong to the interval.
$-30^{o}\not\in[0^{o},360)$, so it can not be considered as a solution.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 7 - Trigonometric Identities and Equations - 7.6 Trigonometric Equations - 7.6 Exercises - Page 720: 13
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