Re: mathematica gives strange result

*To*: mathgroup at smc.vnet.net*Subject*: [mg111272] Re: mathematica gives strange result*From*: SNC <snc at irc.pl>*Date*: Mon, 26 Jul 2010 06:35:37 -0400 (EDT)*References*: <i2gjom$3m$1@smc.vnet.net> <i2h86h$2hd$1@smc.vnet.net>

On 25 Lip, 13:46, "Nasser M. Abbasi" <n... at 12000.org> wrote: > On 7/24/2010 10:57 PM, SNC wrote: > > > Im trying to find a solution to equation DSolve[-y''[x] + > > ((Csc[x])^2)*y[x] == y[x]/4, y[x], x] but mathematica gives me some > > strange result with expresion (-1+cos^2(x))^(1/4) in it. Why is that > > and how should i interpretate this? > > You got back y(x), which is the solution to the diff equation? > > If you have initial conditions, then you can also plot y(x). > > Mathematica found y(x), which satisfies the ode. I assume that you know > that a solution to an ode is a function which if substituted back into > the ode itself, it satisfies it. > > I am not sure I really answered your question or not. May be it helps if > you said what you expected to see, and why the answer returned seems to > surprise you? > > --Nasser It suprised me because the solution isn't real, i'm looking for real one, but mathematica gives me onle this.