A long time has passed and i thank you for this! However, i was wondering how you calculated the maximum, by paper or by some digital tool? We are allowed to use Wolframalpha and i have inserted all of it in there but i do not recieve the same results as you do!!!

d((10-tan??(22°)x-3 tan?(22°) ?)/x +(tan??(22°)x-3 tan?(22°) ?-2)/x)/(1-((10-tan??(22°)x-3 tan?(22°) ?)/x)( (tan??(22°)x-3 tan?(22°) ?-2)/x))/dx=0 - Wolfram|Alpha

Please take a look at the link.

Best regards

Cyrus1