Solving trigonometric equations numerically



Hi again,

It appears that Maxima is unable to solve equations of the form,

2 * sin(x) = 0.8, where x belongs to [0; 2*pi].

I entered this:

find_root(2*sin(x)=0.8, x, 0, 2*%pi);

and Maxima returned this:

function has same sign at endpoints
[f(0.0)=-0.8,f(6.283185307179586)=-0.8]
 -- an error.  To debug this try debugmode(true);

Is there a way to solve this kind of equation?

By the way, I have found very few difficulties using Maxima for my
school work. It's really a great piece of software :)

-- 
Sincerely,

Dan Sondergaard