> Roy said:
> I assume that you mean y=sin(x)

  You are right!  sen(x) comes from spanish (my first language)....

>
> I'm pretty sure there isn't an analytical (btw, analytical != numerical)
> solution to this, not of the form
> x=(some combination of basic functions).
> y=(some combination of basic functions).


> I'd suggest a numerical approach, such as bisection (or something that
> converges a little faster) to get a number with whatever accuracy you
want.

Now I realize the difference between analytical and numerical solutions...

> Try to find the zero crossing point of 1-x*x-sin(x) in whatever region you
> want (there will be more than one solution, one positive, one negative I
> think).

  I think I will try first with bisection. Thanks for the help Roy,

Regards,

*Carlos*


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