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Trivial integral substitution quirk
06-29-2021, 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.


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06-30-2021, 03:03 AM
Post: #2
RE: Trivial integral substitution quirk
I tried it as well with the same results.
The CAS-systems of TI (both nspire and ti 89 titanium) and casio (PC Software of Classpad II) solve both integrals without any problems.
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06-30-2021, 07:04 AM
Post: #3
RE: Trivial integral substitution quirk
Hi, if you press "simplify", the integral is solved.

Sincerely, Robmio


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06-30-2021, 03:35 PM
Post: #4
RE: Trivial integral substitution quirk
(06-30-2021 07:04 AM)robmio Wrote:  Hi, if you press "simplify", the integral is solved.

Sincerely, Robmio

Now, that's funny. Thanks!
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07-01-2021, 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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