CAS bug?


Tan(x)integral from 0 to oo crashes my HP 40G. How about Hp 49G ?


I am crashing too!! What can the integral of sin, cos, or tan be, when integrated to infinity? Maybe Lewis Carroll could tell me.


Integral of Tan(x) is -ln(cos(x)) which has a singularity at x=pi/2 (and 3/2 pi, 5/2 pi etc). So the integral from 0 to x=pi/2 would be oo.
Although, you can calculate the Cauchy principal value (limit for x-> pi/2) of the integral from 0 to pi, which is 0.
Hopefully not to confusing eplained...

Greetings from Jena, Germany



would this singularity raise to oo if PI/2 is not exact? Is the exact-mode flag set? What about trying in Approximate mode?

I did not try it, but I thought I could suggest it.

Regards from Brazil.

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP Prime: CAS taylor Alberto Candel 5 1,549 12-13-2013, 09:45 PM
Last Post: Alberto Candel
  HP Prime CAS curiosity bluesun08 11 2,287 12-10-2013, 01:03 PM
Last Post: Han
  [HP-Prime CAS] "Warning, ^ (Command) Is ambiguous on non square matrices"?? CompSystems 1 1,033 12-07-2013, 07:15 PM
Last Post: CompSystems
  HP Prime: complex numbers in CAS. Alberto Candel 1 862 12-06-2013, 02:36 PM
Last Post: parisse
  [HP Prime] plotfunc() bug in CAS Chris Pem10 2 1,062 12-04-2013, 02:46 PM
Last Post: Chris Pem10
  HP Prime: Home/CAS? Alasdair McAndrew 11 1,856 11-26-2013, 02:48 PM
Last Post: Alberto Candel
  HP Prime numerical precision in CAS and HOME Javier Goizueta 5 1,087 11-16-2013, 03:51 AM
Last Post: Paul Dale
  Need CAS help Michael de Estrada 6 1,233 11-13-2013, 01:29 AM
Last Post: cyrille de Brébisson
  HP Prime - CAS functions in Spreadsheet App CR Haeger 6 1,277 11-11-2013, 12:37 AM
Last Post: Michael de Estrada
  Another HP Prime CAS question Michael de Estrada 3 876 11-09-2013, 10:56 AM
Last Post: Michael de Estrada

Forum Jump: