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Homework Help: RLC ckt's underdamped response

  1. Aug 29, 2006 #1

    how can i get A cos (omega t) + B sin (omega t)

    into this form: C cos (omega t + theta) ?

    does it equal to A+B cos (omega t - 90) ???

    i know it has to do with the underdamped response of an RLC circuit. i
    was looking into phasors as well.

    any help would be greatly appreciated.

  2. jcsd
  3. Aug 29, 2006 #2


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    Science Advisor
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    Gold Member

    I do not think you can friend.
  4. Aug 29, 2006 #3


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    Staff: Mentor

    If A=B and C=2A, I think you can get it to work. But not in the general case where the amplitudes of the sin and cos components are different.
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