I need help in solving an interesting extreme values problem. There are only two Cos terms involved. It seems to be a simle task, but it's difficult for me. I can't get the 3rd derivates in turning point calculation without running out of memory. May be one of You is able to help.
I have appended the problem description as a notebook, ready to get started.
Thank you in advance!
Attachment: Problem.nb, URL: ,