I really hoped the trig book would help me get over my mental block, but it still didn’t work. There’s something about Trigonometry that just befuddles me.
Have you seen the animation about how sin/cos/tangent are derived? I was absolutely befuddled by trig although I was able to do it by learning rules, until I saw that thing.
Just in case you haven't:
https://www.youtube.com/watch?v=a_zReGTxdlQ