Represent sinh2x as power series

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SUMMARY

The discussion focuses on finding the first three non-zero terms of the power series representation of the function f(x) = sinh(2x). Participants confirm that substituting 2x for x in the Taylor series expansion of sinh(x) yields the correct terms: 2x, 8x³/3!, and 32x⁵/5!. The conversation emphasizes the utility of understanding the Taylor series and the exponential function representation of sinh(x) for solving such problems efficiently.

PREREQUISITES
  • Understanding of Taylor series expansion
  • Knowledge of hyperbolic functions, specifically sinh(x)
  • Familiarity with exponential functions and their series
  • Basic calculus skills, including differentiation
NEXT STEPS
  • Study the Taylor series for various functions, including sinh(x) and cosh(x)
  • Learn how to derive hyperbolic functions from exponential functions
  • Explore the application of Taylor series in solving differential equations
  • Practice problems involving power series representations of other functions
USEFUL FOR

Students in calculus, particularly those studying power series and hyperbolic functions, as well as educators looking for examples of Taylor series applications.

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Homework Statement



find the first three non zero terms of a power series representation of f(x)= sinh 2x

Homework Equations



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The Attempt at a Solution



seems easy enough do I just substitute 2x for x?

so sinh 2x= 2x + 8x3/3! + 32x5/5!
 
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Yes that should be correct.
 
Thanks I messed this one up on a test because I forgot to put the formula on my cheat sheet but damn that was easy
 
You didn't really need to have the formula on your cheat sheet if you know how to differentiate sinh(2x). Just use the general formula for a Taylor series.
 
Dick said:
You didn't really need to have the formula on your cheat sheet if you know how to differentiate sinh(2x). Just use the general formula for a Taylor series.

Or if you know how to express sinh(x) in terms of exponentials, and you know the Taylor series for exp(x).
 
Well I tried using Taylor series and am happy to say that was also very easy and much more satisfying. Those Taylor series aren't so bad after all:)
 

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