Periodic function Roots

*To*: mathgroup at smc.vnet.net*Subject*: [mg58391] Periodic function Roots*From*: "FBellas" <no at e.s>*Date*: Thu, 30 Jun 2005 04:37:27 -0400 (EDT)*Organization*: Universidade de Vigo*Sender*: owner-wri-mathgroup at wolfram.com

Hello, I'm trying to solve an periodic ecuation involving several harmonics (Style ACos(x)+BCos(2x)+...==K). Mathematica can't let me us 'Solve' function, so it gives me the error: Solve::tdep: The equations appear to involve the variables to be solved for \ in an essentially non-algebraic way. To arrange this, i'm making a little program involving FindRoot function to find at least two roots from the ecuation in the first period. But I would like to know if there are some other method to do this more easily. Thanks a lot F. Bellas