This seems to be the only mnemonic in this thread that matches soh-cah-toa, and ...

nineteen999 · on March 7, 2018

The one we were taught was "Silly old Hitler caused awful headaches to our allies".

bigger_cheese · on March 7, 2018

"All Stations To Central" is the mnemonic I still remember as you progress around quadrants of circle:

Whenever I pass through central station in Sydney I hear my high school math teacher's voice:

Less than PI/2 "All are positive PI/2 through to PI "Sin is positive" PI through to 3/2 PI "Tan is positive" 3/2 PI through to 2PI "Cos is positive"