[Suppafly]

>Neither in (German) high school nor in the many math courses of a physics B.Sc. have I ever used the secant function

I think we used it in geometry in US high school, but only to complete an assignment or two to show we could use trig functions correctly. I had to relearn how all of them worked to help my kid with homework, it's mostly look at the angles and sides you have available and pick which trig function is necessary to figure out which one you're solving for. I'm sure there are real life uses for trig functions, and I hate to be one of those "when are we ever going to use this" types, but I've never used any of them outside of math classes.

[kevin_thibedeau]

Law of sines is useful when constructing things with a known angle outside of CAD.