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when toggle format what by license comment
Oct 31, 2017 at 2:04 comment added Snoob Thanks for your answer, I want to check both of yours as the answer but this site only accept one. Your answer address the question from the formula point of view and Neil_UK's answer give me a clear picture to conceptualize
Oct 30, 2017 at 14:39 history answered Daniel Duque CC BY-SA 3.0