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Nov 21, 2019 at 16:54 vote accept Kerighan
Nov 20, 2019 at 21:10 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 20, 2019 at 21:04 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 20, 2019 at 17:19 comment added Kerighan thank you for this great answer.
Nov 20, 2019 at 13:01 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 20, 2019 at 13:00 comment added Iosif Pinelis @MaximilianJanisch : Nothing to be sorry about. I had to be more careful.
Nov 20, 2019 at 8:32 comment added Maximilian Janisch @IosifPinelis Sorry for causing that extra work
Nov 20, 2019 at 4:55 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 20, 2019 at 4:47 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 20, 2019 at 4:30 comment added Iosif Pinelis @MattF. : Thank you for the alert. I have redone the entire answer. (The problem was that I previously used a somewhat incorrect expression from Maximilian Janisch's answer.)
Nov 20, 2019 at 4:27 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 20, 2019 at 1:47 history edited Iosif Pinelis CC BY-SA 4.0
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Nov 19, 2019 at 21:01 comment added user44143 The second case has a complex part after the $\cot$?
Nov 19, 2019 at 17:56 history answered Iosif Pinelis CC BY-SA 4.0