sin/cos for me were quite common since I'm fond of geography and geometry. So, even though they weren't needed at all, I had areas to apply them.

I never needed any math like log/exp at work, but somehow remembered it, probably because I used to do some fast estimations of things, for instance, "how big a pool of water you need to store energy to heat a house in winter", or "how fast will energy dissipate from the pool".

And that was probably thanks our school physics teacher, who showed that such napkin calculations were easy.