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when toggle format what by license comment
Oct 22, 2015 at 22:20 comment added Hicham I was correcting the formula in the same time you posted your comment :)
Oct 22, 2015 at 22:19 comment added Wenliang Where did the ${1\over2}$ go?
Oct 22, 2015 at 22:18 history edited Hicham CC BY-SA 3.0
added 15 characters in body
Oct 22, 2015 at 22:14 vote accept Wenliang
Oct 22, 2015 at 21:18 history answered Hicham CC BY-SA 3.0