Laplace Transform of f(t) x cos(t)

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SUMMARY

The discussion focuses on finding the Laplace transform of the product of a function f(t) and cos(t), given that the Laplace transform of f(t) is F(s). The key property utilized is L{f x g} = F(s) * G(s), where G(s) represents the Laplace transform of cos(t). The participant seeks clarification on applying this property, specifically in the context of convolution. An example illustrating the application of these properties is requested for better understanding.

PREREQUISITES
  • Understanding of Laplace transforms and their properties
  • Familiarity with convolution in the context of Laplace transforms
  • Knowledge of basic functions like cos(t) and their transforms
  • Proficiency in manipulating algebraic expressions involving transforms
NEXT STEPS
  • Study the Laplace transform of cos(t) to determine G(s)
  • Learn about the convolution theorem in Laplace transforms
  • Practice examples of Laplace transforms involving products of functions
  • Explore advanced properties of Laplace transforms for complex functions
USEFUL FOR

Students studying differential equations, engineers applying Laplace transforms in control systems, and anyone seeking to understand the application of transforms in solving linear time-invariant systems.

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Homework Statement


Find the Laplace transform of f(t) x cos(t) (multiplication) if the Laplace transform of f(t) is F(s).


Homework Equations


291f841863bc17cdcbb7fc75d0a2ec14.png

70393e2b0002a1a0d393bbd4acc4da9c.png


The Attempt at a Solution



I'm pretty sure I am supposed to use the second equation, however I do not understand how to use it. If you could give me an example on how to find the Laplace Tranform of f(t) x g(t) that would be very helpful.

Thank you
 
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The laplace transform has the following properties.

L{f x g} = F(s)*G(s) (i)

L{f*g} = F(s)xG(s) (ii)

* stands for convolution.

Property (i) is pretty much your eqn 2.
 

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