Omnimaga
General Discussion => Other Discussions => Math and Science => Topic started by: northern_snow on October 14, 2011, 08:12:51 am
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TI using a bad CAS on its 68k and NSpire series.
Both of NSpire CAS and TI-89 titanium can't solve:
integral 1/(sqrt(x+1)+sqrt(x-1))
But both Classpad and hp-50g can...
I wonder what BAD CAS does TI use?
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Not sure, but from what I've heard many engineers and people in higher level maths recommend the Hp50G over the TI-89. They really give the HP's a ton of praise. TI probably licensed a cheap CAS.
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I asked solve(f(x)=0,x) and it returned "true" (with f(x)=sqrt(x-4sqrt(x-4))+sqrt(x+6-5sqrt(x-4))) :w00t:
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That's a nasty little integral you have there. I'm not surprised TI's CAS couldn't solve it. From what I'm aware, the CAS on the 89 and the Nspire is a modern form of TI's old DERIVE CAS. That CAS wasn't particularly good, but it's also not entirely horrible. The calcs probably use a limited form that has more problems.
On the other hand, HPs are better for math because HP spends a lot of time programming those calcs to do math very well. They really are the best calcs for math. Good thing calculators were never meant for math, eh? :P
Hayleia: No solutions exist for that one.