I left college about 12 years ago and I use physics and linear algebra nearly every day, along with trigonometry and a bunch of other branches of math.
The thing for me is that I didn't use it until 4 years ago and now I find myself going through the bibliography of classes I took more than a decade ago to try and 'remember' all this stuff.
As for what I use it for? Right now I'm doing a bit of 3d stuff in the browser (javascript and three.js), the library takes care of many details, but one of the first things I had to do was print a trigonometry cheatsheat (sin, cos, arctan...) and put it on the wall.
The thing for me is that I didn't use it until 4 years ago and now I find myself going through the bibliography of classes I took more than a decade ago to try and 'remember' all this stuff.
As for what I use it for? Right now I'm doing a bit of 3d stuff in the browser (javascript and three.js), the library takes care of many details, but one of the first things I had to do was print a trigonometry cheatsheat (sin, cos, arctan...) and put it on the wall.