Recent content by stephane l

  1. S

    Hi, what is the particular solution of this ODE?

    The ODE is y''+2y'+2y=2e^(-x)sinx which has to be solved using the annihilator method. I need to find the particular solution yp, and I find it to be yp=e^(-x)(A*cosx+B*sinx) which does not work when you plug in the ODE. So apparently yp=-xe^(-x)cosx , but I have no clue how they found it.
  2. S

    Hi, what is the particular solution of this ODE?

    The ODE is y''+2y'+2y=2e^(-x)sinx which has to be solved using the annihilator method. I need to find the particular solution yp, and I find it to be yp=e^(-x)(A*cosx+B*sinx) which does not work when you plug in the ODE. So apparently yp=-xe^(-x)cosx , but I have no clue how they found it.
  3. S

    HI, how do I find the volume of a sphere using polar coordinates and double integrals?

    The radius of the sphere is 3 and the problem needs to be solved the way I specified.
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