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Math Help - Boundary Conditions

  1. #1
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    Boundary Conditions

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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by signature View Post
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    the method of undetermined coefficients should work nicely here. first find the homogeneous solution, then the particular solution using your initial conditions to solve for any arbitrary constants that may arise... am i helping here? you think you can start?

    see post #6 in Chris' differential equations tutorial (link in my signature)
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  3. #3
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    differential equations

    Quote Originally Posted by Jhevon View Post
    the method of undetermined coefficients should work nicely here. first find the homogeneous solution, then the particular solution using your initial conditions to solve for any arbitrary constants that may arise... am i helping here? you think you can start?

    see post #6 in Chris' differential equations tutorial (link in my signature)
    I tried using the xp = Atcos2t + Btsin2t + Ccos6t +Dsin6t

    When i differentiated it twice, it gets really messy.

    Can you please show me how it works.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by signature View Post
    I tried using the xp = Atcos2t + Btsin2t + Ccos6t +Dsin6t

    When i differentiated it twice, it gets really messy.

    Can you please show me how it works.
    that is the correct choice. yes, it's going to be messy. note that you have to use the product rule to differentiate the first two terms. what did you end up with?
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