Answer
$5\cos x-3i\sin y$
Work Step by Step
Step 1: $(3\cos x+4i\sin y)+(2\cos x-7i\sin y)$
Step 2: $(3\cos x+2\cos x)+(4i\sin y-7i\sin y)$
Step 3: $5\cos x-3i\sin y$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 8 - Section 8.1 - Complex Numbers - 8.1 Problem Set - Page 426: 41
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