Why for a small q can you say cos q = 1 – ½q^2. os there a derivation or is this just induction>

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Why for a small q can you say cos q = 1 – ½q^2. os there a derivation or is this just induction>

Mathematics
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do your own hw -_-
Why did you repost this question?
this isn't homework :P. because i'm looking for a derivation.

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is this just intuitive or is there a proof behind it, and what method would i use to prove it?
do it by yourself :)
^ i don't think you were here when someone asked 20 questions about systems. _that_ was homework.
At least people answer . unlike you :)
i answer :P. you're just not on here at 2 am
http://www.wolframalpha.com/input/?i=cos+q+%3D+1+%E2%80%93+%C2%BDq%5E2. check that out
people don't answer yours :)
Lol. I have a life so i'm out have fun in open study . Nikkixoxo <3

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