Hi, everyone. I'm new about this tool. I want to solve a simultaneous equation with the trigonometric terms which is really complicated for me. I'm not sure whether the way I operate the tool is right. Until today the time of calculation is about 7 hours. Is there any advice to solve this problem or is there any problem with my operation? The code is shown below and the file is attached. Thanks a lot!!
A problem that complicated can probably only be handled by FindRoot