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What is 7(cos (pi/2) + i sin (pi/2)) divided by 8 (cos (3pi/4) + i sin (3pi/4)) equal to?

What is 7(cos (pi/2) + i sin (pi/2)) divided by 8 (cos (3pi/4) + i sin (3pi/4)) equal to?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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What is 7(cos (pi/2) + i sin (pi/2)) divided by 8 (cos (3pi/4) + i sin (3pi/4)) equal to? 

A. 7/8 (cos (pi/4) + i sin (pi/4)) 

B. 8/7 (cos(pi/4) + i sin (pi/4)) 

C. 8/7 (cos (pi/4) - i sin (pi/4)) 

D. 7/8 (cos (-1/4) + i sin (-1/4)) 

E. 7/8 (cos (pi/4) - i sin (pi/4)) 

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