Q2b Math104 (2016) and others on this exam
From User talk:ZIMINGYIN
Do you have permission to use that graphic? Also, I assume that your other solutions for this exam are copied from Shawn's solutions, so ditto in case you used his workings verbatim. (Yes, I know you can't copyright 2+3=5 or d/dx(sin x)=cos x, or whatever, but if your steps are identical, then, I think it's not right to copy this without attribution.)