solving trigonometric equations problem

Hi

I want to solve following trigonmetric equation in matlab 2010

cos(alpha) = 0.5

and I want to get alpha in degrees, so...60

I Tried following code,...

syms x
s = solve(cos(x)== 1)

but i get this:

*_??? Error using ==> char
Conversion to char from logical is not possible.

Error in ==> solve>getEqns at 169
   vc = char(v);

Error in ==> solve at 67
[eqns,vars] = getEqns(varargin{:})_*

Thans in advance...

Answer 1

[Azzi Abdelmalek]

 syms x 
 s = solve(cos(x)-0.5)*180/pi

Answer 2

[Walter Roberson]

Your MATLAB version is not new enough to understand using == in a symbolic expression. R2012a or later is required for that. Use Azzi's solution -- i.e.,

solve(A==B)

being equivalent to

solve((A)-(B))