8.41.1 Top new questions this week

8.41.1.1 What Reap/Sow tricks do you use?
8.41.1.2 $\int \frac \tan^2 x  1+x^2  dx$
8.41.1.3 Is it possible to hide or delete the new Toolbar in 13.1?
8.41.1.4 Fail to understand Ordering[], need to get the ranking of elements in a list
8.41.1.5 Why does Length[Names["System`*"]] give different values on Windows and Linux?
8.41.1.6 Delete duplicates element sublist
8.41.1.7 Can I use NextPrime[n] up to n=10^14?
8.41.1.1 What Reap/Sow tricks do you use?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277311

I admit that I have been reluctant to use  Reap  and  Sow  for years and that I used it only when I had no choice with ... 
[list-manipulation] [numerics] [expression-manipulation] [sow-reap]
 
asked by userrandrand https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=86543 Score of 10
8.41.1.2 $\int \frac \tan^2 x  1+x^2  dx$

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277204

Motivated by this integral, which does not evaluate in Mathematica, I'm wondering if there is some trick or substitution that will solve the indefinite integral. 
My motivation is to find integrals ... 
[calculus-and-analysis]
 
asked by David G. Stork https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9735 Score of 9
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 22
8.41.1.3 Is it possible to hide or delete the new Toolbar in 13.1?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277179

Is it possible to delete or hide the new toolbar in 13.1?  How?  It's a great resource, however, for my applications, it's not very useful. It's also glitching out making it impossible to use on most ... 
[front-end] [toolbar]
 
asked by B flat https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=33996 Score of 6
answered by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 Score of 9
8.41.1.4 Fail to understand Ordering[], need to get the ranking of elements in a list

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277323

Ordering[{2, 1, 6, 4, 7, 10}] 
gives me as a result, {2, 1, 4, 3, 5, 6}, which I understand, 10 is the 6th smallest element. However 
... 
[sorting]
 
asked by Michael Fischer https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=75854 Score of 5
answered by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 Score of 8
8.41.1.5 Why does Length[Names["System`*"]] give different values on Windows and Linux?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277320

I was just curious about this. 
 Length[Names["System`*"]] 
 
Gives slightly different value on Linux and Windows 10.  I was wondering why that is as I have ... 
[system] [installation]
 
asked by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 5
8.41.1.6 Delete duplicates element sublist

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277339

I'm wondering if this is possible to delete duplicate elements if a=b and b=a using deleteduplicates or any simple way. 
... 
[list-manipulation]
 
asked by TheInvisibleParticle https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=89333 Score of 4
answered by E. Chan-López https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53427 Score of 3
8.41.1.7 Can I use NextPrime[n] up to n=10^14?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=277295

I would like to perform computations with primes up to $n=10^{14}$. To do so, I would like to go through all primes, from $2$ to $10^{14}$ and perform some calculation on each prime. 
I saw that one ... 
[number-theory] [prime-numbers] [big-numbers]
 
asked by Klangen https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=49819 Score of 4
answered by rhermans https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=10397 Score of 9