Why don’t we have a thread for each regent where students can post questions they don’t understand and teachers (and former teachers) can post the answers and explanations.
Here’s a tip I taught my trigonometry class to remember sine, cosine and tangent-
Sine = Opposite / Hypotenuse,
Cosine = Adjacent / Hypotenuse,
Tangent = Opposite / Adjacent.
The order of the three is the same on all calculators- sine, cosine and tangent.
To remember the letters O H A H O A, make a sentence- Oh Heaven, Another Hour Of Avi.
I find it amazing that some of them still remember it years later.