Answer
false
Work Step by Step
Our calculator, set to DEGREES, gives
$\sin 50^{o}+\sin 40^{o}\approx$1.40883205281
and
$\sin 90^{\mathrm{o}}=1$,
LHS$\neq$RHS
the statement is false.
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 2 - Review Exercises - Page 94: 39
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