Trivial integral substitution quirk

06292021, 04:48 PM
Post: #1




Trivial integral substitution quirk
The indefinite integral of (4/x^5)*cos((1/x^4)6) is returned unevaluated while for the simpler case of (4/x^5)*cos(1/x^4) it is evaluated without issues. Image attached to demonstrate what I mean.


06302021, 03:03 AM
Post: #2




RE: Trivial integral substitution quirk
I tried it as well with the same results.
The CASsystems of TI (both nspire and ti 89 titanium) and casio (PC Software of Classpad II) solve both integrals without any problems. 

06302021, 07:04 AM
Post: #3




RE: Trivial integral substitution quirk
Hi, if you press "simplify", the integral is solved.
Sincerely, Robmio 

06302021, 03:35 PM
Post: #4




RE: Trivial integral substitution quirk  
07012021, 07:05 PM
Post: #5




RE: Trivial integral substitution quirk
I made a fix in giac source code (https://github.com/geogebra/giac/commit/...975563e66d) ... but I have no idea when it will be available on the Prime.


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