Years ago, when I first taught Precalculus at the college level, I was starting a section on trigonometry by reminding my students of the acronym SOHCAHTOA for keeping the trig functions straight:
At this point, one of my students volunteered that a previous math teacher had taught her an acrostic to keep these straight: Some Old Hippie Caught Another Hippie Tripping On Acid.
Needless to say, I’ve been passing this pearl of wisdom on to my students ever since.
Small problem: I get “Formula does not parse” three times.
Thanks for the heads up… I believe it’s fixed now.