MathGroup Archive 2002

[Date Index] [Thread Index] [Author Index]

Search the Archive

confusion with triple integral...

  • To: mathgroup at
  • Subject: [mg32469] confusion with triple integral...
  • From: Bradley Stoll <BradleyS at>
  • Date: Tue, 22 Jan 2002 03:19:49 -0500 (EST)
  • Sender: owner-wri-mathgroup at

Please consider the Integral[r^2Sin[x]drdxdy] with limits as follows:
[0,2Pi]for y, [0,ArcCos[1/4]] for x and [0,1/Cos[x]] for r.  Mathematica returns
27Pi, which is correct.  But, if instead of using ArcCos[1/4], I use either
ArcCos[0.25] or ArcCos[1/4]//N in the limits, Mathematica returns 43Pi.  Any idea

Bradley Stoll
San Jose, CA

  • Prev by Date: buttons
  • Next by Date: Re: Why doesn't this rule work?
  • Previous by thread: Re: buttons
  • Next by thread: Re: confusion with triple integral...