fsolve question

[roadrunner]

Hello,

I’m new to PPL and have a question about fsolve. I’m trying to run this function:

export tdew2()
begin
HAngle:=0;
local x, y;
y:=fsolve(cos(x)=.5,x);
return y;
END;

When I do, I get this error message:

"fsolve(((cos(0))==0.5),0) Error: Bad Argument Value"

I can run: fsolve(cos(x)=.5,x) directly from the input line and get the correct answer. I get the same results on the emulator and the calculator, and in CAS and HOME mode. Can anyone tell me what I am doing wrong?

   
   

Any help would be greatly appreciated.

Paul