Tags: trig-identities, trig, computation, a--a, t1, c1
I think this is a pretty standard, but important exercise to work on, to remind them that they can rederive trig identities in a pinch. I personally like to push the “go back to the circle” approach, but don’t try to unteach any odd mnemonics they have.
– Eric Hsu 1998-08-09