Trig is honestly the math I've used the most since finishing school. But to be fair, that is mostly because it's useful as hell when doing game development as a hobby.
I like math :) Its mysterious and fascinating and constantly surprising, like seeing the source code of the universe. Closest shit we have to actual magic.
One day, while working on a website, I was wondering how to calculate a specific point in a graph. After googling, the answer was by using sine and cosine. Mind blew away, I had always thought I'd never use them.
I use trig every few years when buying a tv. Tv specs always list diagonal but rarely horizontal and vertical which is needed for knowing how a TV will fit in a space.
Not me. I went years without until last week I realised I needed them for a script that points an object at a target in Maya. Turns out trig is really fucking universal.
He's known for a different meme, but he's used in this one and manages to look like he's posing at gunpoint after being told "look casual and not afraid. Now, smile."
In HS trig class I asked the teacher what was the actual logic behind the tan function, and she said "well it's just programmed into your calculator" and I said I realized that but how did it work, she told me to go ask the AP calc teacher.