1
Integrate[Tan[t + 1], t]

-Log[Cos[1 + t]]

Integrate[Tan[1.0 t + 1], t]

The second input causes Mathematica 11.3 to hang, requiring one to quit the Kernel

NonDairyNeutrino
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user61531
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    Indeed. Same problem on my Mac laptop (v. 11.3.0). Weird. – David G. Stork Nov 22 '18 at 07:32
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    If you find a bug, report it to Wolfram. Please do not use StackExchange as a bug tracker. Problems won't get fixed unless you report them directly to Wolfram. – Szabolcs Nov 22 '18 at 08:05
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    I'm voting to close this post as off-topic because it is not a question. – Szabolcs Nov 22 '18 at 09:41
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    No, it's a statement to the fact that Wolfram should be making basic software work instead of trying to be all things to all people. There are a lot of inefficiencies and flaws in Mathematica, often worse in newer versions, but on this forum people are just happy talking about workarounds. – user61531 Nov 22 '18 at 09:51
  • Interestingly the problematic integral works fine in the Kernel. – Lotus Nov 22 '18 at 09:58
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    No, on my windows laptop if I start Kernel directly, it also crashes. Also crashes WalframAlpha. I was going to see if on an older version of Mathematica it might work – user61531 Nov 22 '18 at 10:04
  • What worked for me was Integrate[1.0 Tan[t+1],t] and not Integrate[Tan[t+1.0],t]. Sorry for the confusion. – Lotus Nov 22 '18 at 10:12
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    Works fine in Mathematica v 4.1 – user61531 Nov 22 '18 at 11:59
  • Version 10.0 returns Holonomic`HolonomicIndefiniteIntegrate[Tan[1 + 1. x], x] while version 10.4 crashes the Kernel as well. – user61531 Nov 22 '18 at 12:39
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    Report it to Wolfram? – ktm Nov 22 '18 at 17:13
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    I have of course reported this to Wolfram Tech support already. But if I were you (I mean people who frequent this forum), I would have a "Hall of shame" for the most egregious bugs, flaws, and inefficiencies of Mathematica. Public shaming on social media is the way to get problems solved these days. – user61531 Nov 22 '18 at 22:35
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    "Public shaming"? That's precious. Note that MSE is not "social media", it's a technical forum. – Daniel Lichtblau Nov 23 '18 at 15:15
  • It's more of a "Dear Leader" kind of technical forum than I have ever encountered :) – user61531 Nov 23 '18 at 16:04
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    You are welcome to start your own "hall of shame". Others have. SE is not the place. – Szabolcs Nov 23 '18 at 21:48
  • Despite the fact that this discussion seems to have spiralled: This bug no longer happens on version 12.0. – Carl Lange May 23 '19 at 07:59

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