CoS z = 0 = 1/2+ITK, KE ZZ if and only if z=

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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part c) please, z is part of the complex numbers

1) Using Euler's formula prove the following:
2
a) For
For any ZEC sin ² z + Cos² z = 1
b) For any 2₁,2₂ € (
c)
COS (7₁ + Z₂ ) = COS Z₁ cosz, -sinz, Sinz
2
T
cos z = 0 if and only if z = 7 / +TTK, KE ZZ
Transcribed Image Text:1) Using Euler's formula prove the following: 2 a) For For any ZEC sin ² z + Cos² z = 1 b) For any 2₁,2₂ € ( c) COS (7₁ + Z₂ ) = COS Z₁ cosz, -sinz, Sinz 2 T cos z = 0 if and only if z = 7 / +TTK, KE ZZ
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