[AChimp]

Induction is a load of shit. Trig was covered in Grade 9. Complex numbers aren't used until second-year calculus, so there's no point in knowing it until then. Vectors was a 2 day lesson because chances are you'll have already done it in physics, and it's basically just trig all over again

You're right, though, I forgot about the trig identities... here's all it takes to learn them:

1. Look at identity.
2. Memorize identity.
3. When in doubt, convert to sine and cosine. Reduce.