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Math Help - laplace sum

  1. #1
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    laplace sum

    solve x''+9x=cos3t where x(0)=1 and x(pi/2)=-1

    here x'(0) is not given and i am unable to use x(pi/2)=-1

    please help!!
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  2. #2
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    Re: laplace sum

    If you have to use Laplace Transforms, (there are other methods available), run the calculation through with x'(0) as an unknown constant. When you have your solution for x, substitute t=pi/2, x=-1 to evaluate the constant.
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