Partial fraction decomposition with cos() in the numerator

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SUMMARY

The discussion focuses on the application of partial fraction decomposition to the integral involving the expression \(\frac{\cos(ax)}{b^2 - x^2}\). The key takeaway is that the technique should be applied specifically to the denominator \(\frac{1}{b^2 - x^2}\), while recognizing that the cosine function remains multiplied throughout the process. This approach allows for simplification of the integral, enabling easier integration of the resulting terms.

PREREQUISITES
  • Understanding of integral calculus
  • Familiarity with partial fraction decomposition techniques
  • Knowledge of trigonometric functions, specifically cosine
  • Basic algebraic manipulation skills
NEXT STEPS
  • Study the method of partial fraction decomposition in rational functions
  • Explore integration techniques involving trigonometric functions
  • Learn about the properties of the cosine function in integrals
  • Practice solving integrals with similar forms, such as \(\frac{\sin(ax)}{b^2 - x^2}\)
USEFUL FOR

Students in calculus courses, mathematics educators, and anyone seeking to deepen their understanding of integration techniques involving trigonometric functions and rational expressions.

Mr Davis 97
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Homework Statement


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The Attempt at a Solution


I am looking at a particular integral, and to get started, my text gives the indication that one should use partial fraction decomposition with ##\displaystyle \frac{\cos (ax)}{b^2 - x^2}##. Specifically, it says "then make a partial fraction expansion." However, I only learned the technique of partial fraction decomposition in the context of polynomials. I am not sure exactly what it is asking me to do.
 
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It just means to expand the ##\frac{1}{b^2-x^2}## part. The resulting factors will still be multiplied by the cosine.
 
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