I am trying to find the positive root to:
1-4xcos(x)+2x^2 + cos(2x)=0.
I've tried graphing the function and separating into 2 separate functions to find an intersection, but I'm not finding that it has a positive root.
Any NA root finding method can be used to find the root.
Any ideas or clues to what I may be doing wrong?
Thanks.
Are you sure you graphed it?
You could try an interval search (estimate where the root is and whittle this interval down by successive approximations) or something like the Newton-Raphson method.
My calculator is coming up with two very close roots near where CaptainBlack estimated one at.
-Dan