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3.9. (a). Prove that z is either real or purely imaginary if and only if (2)2 = 22. (b). Prove that v2|2| > |Re z|+ |Im z|. %3D

3.9. (a). Prove that z is either real or purely imaginary if and only if (2)2 = 22. (b). Prove that v2|2| > |Re z|+ |Im z|. %3D

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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3.9. (a). Prove that z is either real or purely imaginary if and only if (2)² = 22. (b). Prove that v2|2| > |Re z|+ |Im z|. %3D
Transcribed Image Text:3.9. (a). Prove that z is either real or purely imaginary if and only if (2)² = 22. (b). Prove that v2|2| > |Re z|+ |Im z|. %3D
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