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? >