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Lee49645
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Homework Statement
Simply find L{Sin(bt)}
Homework Equations
My Professor gave us a hint "Use Integration by Parts TWICE"
The Attempt at a Solution
so i start with the usual limit as N -> infinity the integral of e^(-st)sin(bt)dt
Integrating by parts i get ( u = sin(bt) du = bcos(bt) dv = e^(-st) v = (-1/s)e^(-st))
sin(bt)(-1/s)e^(-st) - integral((-1/s)e^(-st) bcos(bt))
cleaning up the problem the integral becomes e^(-st)cos(bt)dt.
This is an endless cycle because after integrating i ended up with an extra uv set and integral e^(-st)sin(bt)dt with a b^2 outside.
it looks nothing like the known answer b/(s^s + b^s)
Homework Statement
Homework Equations
The Attempt at a Solution
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