math at university be like:

Make up a shitty long prove for a thing because your not allowed to use the prove literally everyone uses on the internet that is like half as long and 10 times better, because the better one everyone uses contains some middle school type math, that the professor will only officially mention in about 2 weeks, despite a fucking 12 year old being able to understand it.

Oh yeah it's 2 weeks later the proffessor mentioned that middle school math thing in some random sentence so you now officially allowed to use it.
You can now use the easier prove literally everyone used.
You will never again need the longer prove and if you ever use it again we give you less points, so concrats you learned something you never need again

Doesn't it feel great having wasted hours of your youth for this :))))