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As an engineer i literally use all of it daily.

As an engineer, doubt.

I guess depends on engineer

I use the college stuff maybe once a month, but still in Excel! You cannot escape the Excel!

The my mentioned "all of it" includes excel :) but nowadays we a bit by bit transition to python

What do you use diff eq's for on a daily basis?

Pretty much anything dynamics related. Starting basic displacements, velocity, acceleration integration for simple dynamic systems to more complicated equations for wind and spinning rotor interaction induced vibrations in wind turbines.

If you do not work with dynamics, for statics there are still a lot of encounters with deferential equations. Euler-Bernoulli Beam theory or plate and shell theories can be used for times when you want to solve more complex problems for which predefined equations do not exist and you do not have access to expensive fea software.

As an engineer, you should know it depends greatly on which discipline and what the job duties entail.

I recently had to do linear algebra for the first time ever irl. I’ve been out of school for ~15 years. I was trying to make a rotation matrix to transform some points in 2D space. It took me a very long time to remember how it’s performed yet alone “transformation matrix” which is something I’d never heard of before. I got my code all working and was so proud, then later found that one of the r packages I was using could have just solved it all automatically :/

You guys still use math? The most I get to do is centering a picture in PowerPoint

(Thankfully I will soon be going to do real work but man was that a weird little diversion)