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Sep 30, 2021 at 9:31 comment added joro sagemath is powerful enough to verify your proof on a computer.
Sep 29, 2021 at 12:14 comment added Pietro Majer Nice suggestion, I will ;)
Sep 29, 2021 at 8:52 comment added joro besides false proofs, do you give undecidable problems to your students?
Sep 29, 2021 at 6:42 comment added Pietro Majer of course, but I prefer the limit just to add some more fog --the thing is an exam question ;)
Sep 28, 2021 at 22:37 comment added Alessandro Della Corte Even simpler: ...then $\pi/2=f(1)=f(-1)=-\pi/2$, whence...
S Sep 28, 2021 at 21:39 history answered Pietro Majer CC BY-SA 4.0
S Sep 28, 2021 at 21:39 history made wiki Post Made Community Wiki by Pietro Majer