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Re: solve trig equations


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}]



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