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Re: How to solve this differential equation? (harmonic

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113076] Re: How to solve this differential equation? (harmonic
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Tue, 12 Oct 2010 13:48:24 -0400 (EDT)

Hi,

check the function DSolve

In[2]:= DSolve[x''[t] + w^2*x[t] == 0, x, t]

Out[2]= {{x -> Function[{t}, C[1] Cos[t w] + C[2] Sin[t w]]}}

Cheers
Patrick

On Tue, 2010-10-12 at 04:24 -0400, MathProg wrote:
> I have the differential equation: 
> x'' + w^2*x(t) = 0.
> 
> I don't know how to solve it in Mathematica. I know that the answer is: 
> A * cos( w*t + phi )
> 
> .but how I can get it in Mathematica? Can anyone help me with that?
> 



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