Taylor Development: Combining cos(z) & cosh(z) in Complex Field

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SUMMARY

The discussion focuses on developing the Taylor series for the function \( \cos(z) \cdot \cosh(z) \). Participants confirm that while the Taylor series for both \( \cos(z) \) and \( \cosh(z) \) are known, combining them requires understanding their respective series expansions. The complex field is relevant, as it influences the behavior of these functions, but the combination of the series remains valid regardless of the field.

PREREQUISITES
  • Understanding of Taylor series expansions for \( \cos(z) \) and \( \cosh(z) \)
  • Familiarity with complex analysis concepts
  • Knowledge of exponential functions and their properties
  • Basic skills in mathematical notation and manipulation
NEXT STEPS
  • Study the Taylor series expansion for \( \cos(z) \) and \( \cosh(z) \) in detail
  • Learn how to combine multiple Taylor series into a single series
  • Explore the implications of complex variables in function analysis
  • Investigate the graphical representation of \( \cos(z) \cdot \cosh(z) \) in the complex plane
USEFUL FOR

Students and educators in mathematics, particularly those focusing on complex analysis and series expansions, as well as anyone interested in the applications of Taylor series in complex functions.

asi123
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Homework Statement



Hey guys.
I need to develop Taylor series for this function (cos(z) * cosh(z)).
I know the Taylor development for cos and the Taylor development for cosh but I have no idea how to combine the two, if it's possible, any idea guys?
And another thing, does it matters if we are talking about the complex field?

Thanks a lot.


Homework Equations





The Attempt at a Solution

 

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asi123 said:

Homework Statement



Hey guys.
I need to develop Taylor series for this function (cos(z) * cosh(z)).
I know the Taylor development for cos and the Taylor development for cosh but I have no idea how to combine the two, if it's possible, any idea guys?
And another thing, does it matters if we are talking about the complex field?

Thanks a lot.


Homework Equations




The Attempt at a Solution



cosq= (eiq+ e-iq)/2.
coshq= (eq+ e-q)/2.

might help but you image is yet to be approved.
 
rootX said:
cosq= (eiq+ e-iq)/2.
coshq= (eq+ e-q)/2.

might help but you image is yet to be approved.

Oh, I see.
I'll try it.
Thanks a lot.

BTW the image only shows the function "cosz * coshz" and the Taylor series of this two functions.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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