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Jan 3, 2016 at 13:04 comment added Rory Daulton I'm curious, why the downvote? All the information in this post is correct, I derive it by means that are different from and shorter than the accepted answer, I give alternative formulas, and I note that other useful information can be easily derived along the way. I understand it if you prefer another answer, but why not just upvote that other answer?
Dec 21, 2015 at 1:55 history edited Rory Daulton CC BY-SA 3.0
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Dec 21, 2015 at 1:48 history edited Rory Daulton CC BY-SA 3.0
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Dec 21, 2015 at 1:40 history answered Rory Daulton CC BY-SA 3.0