Answer
-7
Work Step by Step
$\sin 90^{\circ}=1$
$\cos 180^{\circ}=-1$
$\implies$
$-3\sin^{4} 90^{\circ}+4\cos^{3}180^{\circ}=$
$-3(1)^{4}+4(-1)^{3}=-3-4=-7$
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 5 - Trigonometric Functions - 5.2 Trigonometric Functions - 5.2 Exercises - Page 519: 78
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