> How do you remember sin and cos in practice? I draw on the ratios I memorized in high school, e.g. sin=opposite/hypotenuse, but 40+ years later sometimes I'm

> How do you remember sin and cos in practice? I draw on the ratios I memorized in high school, e.g. sin=opposite/hypotenuse, but 40+ years later sometimes I'm not sure so I look it up online. My needs for trigonometry are separated on a scale of years, and at some point knowledge unused is knowledge forgotten.