Re: solve trig equations

*To*: mathgroup at smc.vnet.net*Subject*: [mg125747] Re: solve trig equations*From*: Flavin <flavinj at gmail.com>*Date*: Sat, 31 Mar 2012 03:42:58 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <jl3v0c$3lo$1@smc.vnet.net>

On Mar 30, 4:39 am, Neal Becker <ndbeck... at gmail.com> wrote: > Solve[{Cos[a]+Cos[b]==x,Sin[a]+Sin[b]==y},{a,b},Reals] > Solve::nsmet: This system cannot be solved with the methods available to = Solve. >> > > This is a simple enough system, what am I doing wrong? I don't know why your command doesn't work, but this does. FullSimplify[Solve[{Cos[a]+Cos[b]==x,Sin[a]+Sin[b]==y},{a,b}],{x\ [Element]Reals,y\[Element]Reals}]