Non-homogenous secx ODE's and Euler eq's

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Discussion Overview

The discussion revolves around solving non-homogeneous ordinary differential equations (ODEs) that involve the secant function, specifically Asec(x) on the right-hand side, and its application in Euler equations. Participants explore different methods for addressing this type of problem.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant inquires about solving non-homogeneous ODEs with Asec(x) on the right-hand side, expressing familiarity with solutions involving sine and cosine but not other trigonometric functions.
  • Another participant suggests that the method of annihilators is typically used for certain functions like cos(x) and sin(x), but indicates that it may not apply to sec(x), recommending the variation of parameters method instead.
  • A different participant proposes using a power series solution by expanding sec(x) in a power series, referencing a Wikipedia article for further information.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for solving the ODEs involving sec(x), with multiple approaches being suggested and no clear agreement on a single solution method.

Contextual Notes

Some methods mentioned may depend on specific conditions or assumptions about the functions involved, and the applicability of the annihilator method to sec(x) remains unresolved.

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Suppose we have Asec(x) on the right hand side in a non-homogenous ODE and in a Euler equation. How do we solve it? ( I know how to solve for cos and sin on the right hand side but not for any other trig function).
 
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For non-homogeneous ordinary differential equations, i was taught that you always had to use the method of annihilators if the right hand side was either cos(x), sin(x), exp(x), a polynomial function or the product and sum of any of these functions. For functions like sec(x)=1/cos(x) the annihilator method won't work, and therefore you will need to use the variation of parameters method to solve your differential equation.

It's how i was taught, so i don't know if there is another method out there that could be used.
 

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