We are working on the Trig Chapter of Holt Geometry. It's pretty plug and chug. Dd is fighting me because she wants to know why sin, cos, and tan work. She's seen books of trig tables and wants to know where those numbers come from. Since I have have no idea, I told her to go re-read the Fiendish Angletron and plug and chug for now, and I would find out. Math is easier for her when she gets the whys.

ETA- Can anyone point me to a resource that explains this? Thanks!

**Edited by MamaSprout, 10 January 2018 - 11:53 AM.**