The times they are a-changin’.
This post seems to be older than 17 years—a long time on the internet. It might be outdated.
Wikipedia has a list of trig identities.
I’m not quite sure what’s worse, the fact that Wikipedia has them or the fact that I need to use them.
Calc III exam at 7:30 6:30.
Here are the three I’ve been using a lot:
- Sin2[x] = (1-Cos[2x])/2
- Cos2[x] = (1+Cos[2x])/2
- Sin2[x] + Cos2[x] = 1
Bah.
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