Laplace Transform (Linear Algebra)

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Homework Help Overview

The discussion revolves around evaluating the Laplace transform of the function {t²e^(7t)sinh(3t)}. The subject area is primarily focused on Laplace transforms within the context of linear algebra and differential equations.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the Laplace transform, particularly in relation to functions multiplied by exponential terms. There is uncertainty about how to proceed with the transformation, especially regarding the potential need to split functions or use a unit step function. One participant suggests using the shift theorem for the s-axis.

Discussion Status

There is an ongoing exploration of different approaches to the problem. Some participants are questioning the assumptions related to the use of the unit step function and the application of the shift theorem. A suggestion has been made to express sinh(3t) in terms of exponential functions, which may guide further discussion.

Contextual Notes

Participants are grappling with the complexity of the function and the implications of the Laplace transform rules, particularly in relation to the exponential and hyperbolic sine components. There is a noted lack of consensus on the best method to proceed.

yesiammanu
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Homework Statement


Evaluate the laplace transform of {t2e7tsinh(3t)}


Homework Equations


Laplace transform of {tnf(t)}=(-1)ndn/ds2 * F(s)


The Attempt at a Solution


I've replaced it with (-1)2d2L{e7tsinh(3t)}

I'm not sure how to proceed, though, as I don't really see how to take the laplace without somehow splitting up these functions. Do I use a unit step function? How would I use it if so? I'm not really sure what to do here

Thanks for any help.
 
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The Laplace transform of a function that has been multiplied by an exponential function can be found using the shift theorem for the s-axis. Do you know this theorem?

BiP
 
Is this the theorem you were referring to?

L{e-asF(s)}=f(t-a)*UnitStep(t-a)
 
yesiammanu said:

Homework Statement


Evaluate the laplace transform of {t2e7tsinh(3t)}


Homework Equations


Laplace transform of {tnf(t)}=(-1)ndn/ds2 * F(s)


The Attempt at a Solution


I've replaced it with (-1)2d2L{e7tsinh(3t)}

I'm not sure how to proceed, though, as I don't really see how to take the laplace without somehow splitting up these functions. Do I use a unit step function? How would I use it if so? I'm not really sure what to do here

Thanks for any help.

You can write ##\sinh(3t) = \frac{1}{2} \left( e^{3t} - e^{-3t}\right),## and proceed accordingly.
 

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