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MathGroup Archive 2000

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Re: Integral evaluation bug?

  • To: mathgroup at
  • Subject: [mg23866] Re: Integral evaluation bug?
  • From: Mark Fisher <me.fisher at>
  • Date: Thu, 15 Jun 2000 00:51:05 -0400 (EDT)
  • Organization: Federal Reserve Board
  • References: <8i1t9m$>
  • Sender: owner-wri-mathgroup at

Looks like a bug to me. Try this instead:

Integrate[Sqrt[1 + Cos[x]^2], {x, 0, b}] /. b -> Pi/2

Using Mathematica 4.0 it returns


which agress numerically with 

NIntegrate[Sqrt[1 + Cos[x]^2], {x, 0, Pi/2}]


Mark Fisher
Economic Advisor
Research Department
Federal Reserve Bank of Atlanta
Atlanta, GA 30303
404-521-8757 (voice)
404-521-8810 (fax)
mark.fisher at

personal web page:

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