Complex Analysis: Express f(z)= (z+i)/(z^2+1) as w=u(x,y)+iv(x,y)

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SUMMARY

The discussion focuses on expressing the complex function f(z) = (z+i)/(z^2+1) in the form w = u(x,y) + iv(x,y). The correct transformation yields u(x,y) = x/(x^2+(y-1)^2) and v(x,y) = (1-y)/(x^2+(y-1)^2). Participants emphasized the importance of using partial fractions and rewriting the denominator as (z+i)(z-i) to simplify the problem effectively.

PREREQUISITES
  • Understanding of complex functions and their representations
  • Familiarity with partial fraction decomposition
  • Knowledge of algebraic manipulation of complex numbers
  • Basic concepts of complex analysis, particularly the form w = u(x,y) + iv(x,y)
NEXT STEPS
  • Study partial fraction decomposition techniques in complex analysis
  • Learn about complex number algebra and manipulation
  • Explore the properties of complex functions and their graphical representations
  • Investigate the implications of rewriting complex functions in different forms
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Students studying complex analysis, mathematics educators, and anyone seeking to deepen their understanding of complex functions and their transformations.

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Homework Statement


write f(z)= (z+i)/(z^2+1) in the form w=u(x,y)+iv(x,y)


Homework Equations





The Attempt at a Solution


I tried using the conjugate and also expanding out algebraically but I can not seem to get the right answer. I know what the answer is, x/(x^2+(y-1)^2)+i(1-y)/(x^2+(y-1)^2) but I fail to see how to get there. am I doing something wrong?
 
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all i want is a simple hint i don't want anyone to do the problem for me I just want a little help. just a little push in the right direction would be so helpful.
 
Why don't you try and do the partial fraction. I think it should work.
 
rizardon said:
Why don't you try and do the partial fraction. I think it should work.

So I do the partial fraction after i expand out? expanding (z+i)/(z^2+1) I get (x+yi+i)/(x^2+2xyi-y^2+1) how am I supposed to factor the denominator?
 
ohhhhh nevermind i finally got it you rewrite the denominator as (z+i)(z-i) then do the partial fraction. so simple! you were right rizardonthanks
 

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