Solving transcedental equation

  • Context: Undergrad 
  • Thread starter Thread starter russel.arnold
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Discussion Overview

The discussion revolves around solving the transcendental equation tan(f(x)) = g(x). Participants explore numerical methods for finding solutions and consider the implications of the function's properties, particularly the behavior of the tangent function over its range.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about which numerical method to use for solving tan(f(x)) = g(x) and expresses a desire to determine all possible solutions.
  • Another participant notes that there is no single answer due to the infinite number of asymptotes of the tangent function and suggests that the range of consideration is crucial for selecting a numerical method.
  • This participant also raises questions about the required accuracy of the solutions, proposing that a graphical approach might suffice if high precision is not necessary.
  • A third participant specifies that they will consider the tangent function from 0 to infinity and emphasizes the need for accurate solutions, dismissing the graphical approach as inadequate.
  • Another participant proposes evaluating f(x) first and then using a series expansion of the tangent function to achieve the desired accuracy for solving the equation.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate numerical methods and the importance of the range and accuracy of solutions. There is no consensus on a specific method or approach to take.

Contextual Notes

The discussion highlights the dependence on the chosen range for the tangent function and the accuracy requirements, which remain unresolved. The implications of using a series expansion versus numerical methods are also not fully explored.

russel.arnold
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i want to solve tan (f(x)) = g(x) ..also i want to determine all the possible solutions!
which numerical method i should use?
 
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There is no one answer.

Since tan has an infinite number of asymptotes, the first questions I'd have to ask is, will you be considering a particular range? Once you have a range, any numerical method could do the job.

I'd also wonder how accurate do you need solutions? To two decimal places? Three? Four? . . . If you didn't need a high degree of accuracy, perhaps even a graphical approach would work for you.
 
yes, i will be considering tan from 0 to infinity, i.e all possible branches

and i need my solutions to be accurate. hence graphical approach won't work :(
 
I would first evaluate f(x) and then use that result in the series expansion of tangent taken however far you want to get the accuracy you desire to solve.

That will work for all possible solutions.
 

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