Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Can you answer the problem with complete solution and box the final answer. Our topic is all about complex numbers
Transcribed Image Text:1. Prove that cos²z + sin²z = 1
elz + e¬iz
eiz – e-iz
Note: cos z =
and sin z =
2
; let z = x + iy
2i
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