I have some ideas myself on this one, but I'd love to hear how you guys would proceed in this scenario.
Find the sum of all solutions in the interval for the equation
First, we can put this in the form for better viewing.
We know that is and .
Then our period will equal , so the distance from one to another is
Since our will appear 3 times faster because of the , our first is
Now, can we just go summing it to until we get to ?
What do you guys think?