6. Find the four fourth roots of 7+21 and express the roots in polar form. [A] 1.64 cis 3.99°, 1.64 cis 93.99°, 1.64 cis 183.99°, 1.64 cis 273.99° [B] 7.28 cis 15.95°, 7.28 cis 105.95°, 7.28 cis 195.95°, 7.28 cis 285.95° [C] 7.28 cis 3.99°, 7.28 cis 93.99°, 7.28 cis 183.99°, 7.28 cis 273.99° [D] 1.64 cis 15.95°, 1.64 cis 105.95°, 1.64 cis 195.95°, 1.64 cis 285.95°

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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Please solve problems 6 and 13, correctly. Thank you.

6. Find the four fourth roots of 7+2i and express
the roots in polar form.
[A] 1.64 cis 3.99°, 1.64 cis 93.99°, 1.64 cis
183.99°, 1.64 cis 273.99°
[B] 7.28 cis 15.95°, 7.28 cis 105.95°, 7.28
cis 195.95°, 7.28 cis 285.95°
[C] 7.28 cis 3.99°, 7.28 cis 93.99°, 7.28 cis
183.99°, 7.28 cis 273.99°
[D] 1.64 cis 15.95°, 1.64 cis 105.95°, 1.64
cis 195.95°, 1.64 cis 285.95°
Transcribed Image Text:6. Find the four fourth roots of 7+2i and express the roots in polar form. [A] 1.64 cis 3.99°, 1.64 cis 93.99°, 1.64 cis 183.99°, 1.64 cis 273.99° [B] 7.28 cis 15.95°, 7.28 cis 105.95°, 7.28 cis 195.95°, 7.28 cis 285.95° [C] 7.28 cis 3.99°, 7.28 cis 93.99°, 7.28 cis 183.99°, 7.28 cis 273.99° [D] 1.64 cis 15.95°, 1.64 cis 105.95°, 1.64 cis 195.95°, 1.64 cis 285.95°
13. Solve 2 cos³x
<2T.
13 sin x – 5 given that 0 < x
[A] 6 6
[B] 0
3n 77
[C]
4
[D] 0,
T,
3
Transcribed Image Text:13. Solve 2 cos³x <2T. 13 sin x – 5 given that 0 < x [A] 6 6 [B] 0 3n 77 [C] 4 [D] 0, T, 3
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